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6 NetAddr::IP::Lite - Manages IPv4 and IPv6 addresses and subnets
7
9 use NetAddr::IP::Lite qw(
10 Zeros
11 Ones
12 V4mask
13 V4net
14 :aton DEPRECATED !
15 :old_nth
16 :upper
17 :lower
18 :nofqdn
19 );
20 my $ip = new NetAddr::IP::Lite '127.0.0.1';
22 or if your prefer
23 my $ip = NetAddr::IP::Lite->new('127.0.0.1);
24 or from a packed IPv4 address
25 my $ip = new_from_aton NetAddr::IP::Lite (inet_aton('127.0.0.1'));
26 or from an octal filtered IPv4 address
27 my $ip = new_no NetAddr::IP::Lite '127.012.0.0';
28 print "The address is ", $ip->addr, " with mask ", $ip->mask, "\n" ;
30 if ($ip->within(new NetAddr::IP::Lite "127.0.0.0", "255.0.0.0")) {
32 print "Is a loopback address\n";
33 }
34 # This prints 127.0.0.1/32
36 print "You can also say $ip...\n";
37 The following four functions return ipV6 representations of:
39 :: = Zeros();
41 FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF = Ones();
42 FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:: = V4mask();
43 ::FFFF:FFFF = V4net();
44 Will also return an ipV4 or ipV6 representation of a
46 resolvable Fully Qualified Domanin Name (FQDN).
47
49 Un-tar the distribution in an appropriate directory and type:
50 perl Makefile.PL
52 make
53 make test
54 make install
55 NetAddr::IP::Lite depends on NetAddr::IP::Util which installs by
57 default with its primary functions compiled using Perl's XS extensions
58 to build a 'C' library. If you do not have a 'C' complier available or
59 would like the slower Pure Perl version for some other reason, then
60 type:
61 perl Makefile.PL -noxs
63 make
64 make test
65 make install
66
68 This module provides an object-oriented abstraction on top of IP
69 addresses or IP subnets, that allows for easy manipulations. Most of
70 the operations of NetAddr::IP are supported. This module will work with
71 older versions of Perl and is compatible with Math::BigInt.
72 * By default NetAddr::IP functions and methods return string IPv6
74 addresses in uppercase. To change that to lowercase:
75 NOTE: the AUGUST 2010 RFC5952 states:
77 4.3. Lowercase
79 The characters "a", "b", "c", "d", "e", and "f" in an IPv6
81 address MUST be represented in lowercase.
82 It is recommended that all NEW applications using NetAddr::IP::Lite be
84 invoked as shown on the next line.
85 use NetAddr::IP::Lite qw(:lower);
87 * To ensure the current IPv6 string case behavior even if the default
89 changes:
90 use NetAddr::IP::Lite qw(:upper);
92 The internal representation of all IP objects is in 128 bit IPv6
94 notation. IPv4 and IPv6 objects may be freely mixed.
95 The supported operations are described below:
97 Overloaded Operators
99 Assignment ("=")
100 Has been optimized to copy one NetAddr::IP::Lite object to another
101 very quickly.
102 "->copy()"
104 The assignment ("=") operation is only put in to operation when the
105 copied object is further mutated by another overloaded operation.
106 See overload SPECIAL SYMBOLS FOR "use overload" for details.
107 "->copy()" actually creates a new object when called.
109 Stringification
111 An object can be used just as a string. For instance, the following
112 code
113 my $ip = new NetAddr::IP::Lite '192.168.1.123';
115 print "$ip\n";
116 Will print the string 192.168.1.123/32.
118 my $ip = new6 NetAddr::IP::Lite '192.168.1.123';
120 print "$ip\n";
121 Will print the string 0:0:0:0:0:0:C0A8:17B/128
123 Equality
125 You can test for equality with either "eq", "ne", "==" or "!=".
126 "eq", "ne" allows the comparison with arbitrary strings as well as
127 NetAddr::IP::Lite objects. The following example:
128 if (NetAddr::IP::Lite->new('127.0.0.1','255.0.0.0') eq '127.0.0.1/8')
130 { print "Yes\n"; }
131 Will print out "Yes".
133 Comparison with "==" and "!=" requires both operands to be
135 NetAddr::IP::Lite objects.
136 Comparison via >, <, >=, <=, <=> and "cmp"
138 Internally, all network objects are represented in 128 bit format.
139 The numeric representation of the network is compared through the
140 corresponding operation. Comparisons are tried first on the address
141 portion of the object and if that is equal then the NUMERIC cidr
142 portion of the masks are compared. This leads to the
143 counterintuitive result that
144 /24 > /16
146 Comparison should not be done on netaddr objects with different
148 CIDR as this may produce indeterminate - unexpected results, rather
149 the determination of which netblock is larger or smaller should be
150 done by comparing
151 $ip1->masklen <=> $ip2->masklen
153 Addition of a constant ("+")
155 Add a 32 bit signed constant to the address part of a NetAddr
156 object. This operation changes the address part to point so many
157 hosts above the current objects start address. For instance, this
158 code:
159 print NetAddr::IP::Lite->new('127.0.0.1/8') + 5;
161 will output 127.0.0.6/8. The address will wrap around at the
163 broadcast back to the network address. This code:
164 print NetAddr::IP::Lite->new('10.0.0.1/24') + 255;
166 outputs 10.0.0.0/24.
168 Returns the the unchanged object when the constant is missing or
170 out of range.
171 2147483647 <= constant >= -2147483648
173 Subtraction of a constant ("-")
175 The complement of the addition of a constant.
176 Difference ("-")
178 Returns the difference between the address parts of two
179 NetAddr::IP::Lite objects address parts as a 32 bit signed number.
180 Returns undef if the difference is out of range.
182 Auto-increment
184 Auto-incrementing a NetAddr::IP::Lite object causes the address
185 part to be adjusted to the next host address within the subnet. It
186 will wrap at the broadcast address and start again from the network
187 address.
188 Auto-decrement
190 Auto-decrementing a NetAddr::IP::Lite object performs exactly the
191 opposite of auto-incrementing it, as you would expect.
192 Methods
194 "->new([$addr, [ $mask|IPv6 ]])"
195 "->new6([$addr, [ $mask]])"
196 "->new6FFFF([$addr, [ $mask]])"
197 "->new_no([$addr, [ $mask]])"
198 "->new_from_aton($netaddr)"
199 new_cis and new_cis6 are DEPRECATED
200 "->new_cis("$addr $mask)"
201 "->new_cis6("$addr $mask)"
202 The first three methods create a new address with the supplied
203 address in $addr and an optional netmask $mask, which can be
204 omitted to get a /32 or /128 netmask for IPv4 / IPv6 addresses
205 respectively.
206 new6FFFF specifically returns an IPv4 address in IPv6 format
208 according to RFC4291
209 new6 ::xxxx:xxxx
211 new6FFFF ::FFFF:xxxx:xxxx
212 The third method "new_no" is exclusively for IPv4 addresses and
214 filters improperly formatted dot quad strings for leading 0's that
215 would normally be interpreted as octal format by NetAddr per the
216 specifications for inet_aton.
217 new_from_aton takes a packed IPv4 address and assumes a /32 mask.
219 This function replaces the DEPRECATED :aton functionality which is
220 fundamentally broken.
221 The last two methods new_cis and new_cis6 differ from new and new6
223 only in that they except the common Cisco address notation for
224 address/mask pairs with a space as a separator instead of a slash
225 (/)
226 These methods are DEPRECATED because the functionality is now
228 included in the other "new" methods
229 i.e. ->new_cis('1.2.3.0 24')
231 or
232 ->new_cis6('::1.2.3.0 120')
233 "->new6" and "->new_cis6" mark the address as being in ipV6 address
235 space even if the format would suggest otherwise.
236 i.e. ->new6('1.2.3.4') will result in ::102:304
238 addresses submitted to ->new in ipV6 notation will
240 remain in that notation permanently. i.e.
241 ->new('::1.2.3.4') will result in ::102:304
242 whereas new('1.2.3.4') would print out as 1.2.3.4
243 See "STRINGIFICATION" below.
245 $addr can be almost anything that can be resolved to an IP address
247 in all the notations I have seen over time. It can optionally
248 contain the mask in CIDR notation. If the OPTIONAL perl module
249 Socket6 is available in the local library it will autoload and ipV6
250 host6 names will be resolved as well as ipV4 hostnames.
251 prefix notation is understood, with the limitation that the range
253 specified by the prefix must match with a valid subnet.
254 Addresses in the same format returned by "inet_aton" or
256 "gethostbyname" can also be understood, although no mask can be
257 specified for them. The default is to not attempt to recognize this
258 format, as it seems to be seldom used.
259 ###### DEPRECATED, will be remove in version 5 ############ To
261 accept addresses in that format, invoke the module as in
262 use NetAddr::IP::Lite ':aton'
264 ###### USE new_from_aton instead ##########################
266 If called with no arguments, 'default' is assumed.
268 If called with an empty string as the argument, returns 'undef'
270 $addr can be any of the following and possibly more...
272 n.n
274 n.n/mm
275 n.n mm
276 n.n.n
277 n.n.n/mm
278 n.n.n mm
279 n.n.n.n
280 n.n.n.n/mm 32 bit cidr notation
281 n.n.n.n mm
282 n.n.n.n/m.m.m.m
283 n.n.n.n m.m.m.m
284 loopback, localhost, broadcast, any, default
285 x.x.x.x/host
286 0xABCDEF, 0b111111000101011110, (or a bcd number)
287 a netaddr as returned by 'inet_aton'
288 Any RFC1884 notation
290 ::n.n.n.n
292 ::n.n.n.n/mmm 128 bit cidr notation
293 ::n.n.n.n/::m.m.m.m
294 ::x:x
295 ::x:x/mmm
296 x:x:x:x:x:x:x:x
297 x:x:x:x:x:x:x:x/mmm
298 x:x:x:x:x:x:x:x/m:m:m:m:m:m:m:m any RFC1884 notation
299 loopback, localhost, unspecified, any, default
300 ::x:x/host
301 0xABCDEF, 0b111111000101011110 within the limits
302 of perl's number resolution
303 123456789012 a 'big' bcd number (bigger than perl likes)
304 and Math::BigInt
305 A Fully Qualified Domain Name which returns an ipV4 address or an
307 ipV6 address, embodied in that order. This previously undocumented
308 feature may be disabled with:
309 use NetAddr::IP::Lite ':nofqdn';
311 If called with no arguments, 'default' is assumed.
313 If called with and empty string as the argument, 'undef' is
315 returned;
316 "->broadcast()"
318 Returns a new object referring to the broadcast address of a given
319 subnet. The broadcast address has all ones in all the bit positions
320 where the netmask has zero bits. This is normally used to address
321 all the hosts in a given subnet.
322 "->network()"
324 Returns a new object referring to the network address of a given
325 subnet. A network address has all zero bits where the bits of the
326 netmask are zero. Normally this is used to refer to a subnet.
327 "->addr()"
329 Returns a scalar with the address part of the object as an IPv4 or
330 IPv6 text string as appropriate. This is useful for printing or for
331 passing the address part of the NetAddr::IP::Lite object to other
332 components that expect an IP address. If the object is an ipV6
333 address or was created using ->new6($ip) it will be reported in
334 ipV6 hex format otherwise it will be reported in dot quad format
335 only if it resides in ipV4 address space.
336 "->mask()"
338 Returns a scalar with the mask as an IPv4 or IPv6 text string as
339 described above.
340 "->masklen()"
342 Returns a scalar the number of one bits in the mask.
343 "->bits()"
345 Returns the width of the address in bits. Normally 32 for v4 and
346 128 for v6.
347 "->version()"
349 Returns the version of the address or subnet. Currently this can be
350 either 4 or 6.
351 "->cidr()"
353 Returns a scalar with the address and mask in CIDR notation. A
354 NetAddr::IP::Lite object stringifies to the result of this
355 function. (see comments about ->new6() and ->addr() for output
356 formats)
357 "->aton()"
359 Returns the address part of the NetAddr::IP::Lite object in the
360 same format as the "inet_aton()" or "ipv6_aton" function
361 respectively. If the object was created using ->new6($ip), the
362 address returned will always be in ipV6 format, even for addresses
363 in ipV4 address space.
364 "->range()"
366 Returns a scalar with the base address and the broadcast address
367 separated by a dash and spaces. This is called range notation.
368 "->numeric()"
370 When called in a scalar context, will return a numeric
371 representation of the address part of the IP address. When called
372 in an array context, it returns a list of two elements. The first
373 element is as described, the second element is the numeric
374 representation of the netmask.
375 This method is essential for serializing the representation of a
377 subnet.
378 "->bigint()"
380 When called in a scalar context, will return a Math::BigInt
381 representation of the address part of the IP address. When called
382 in an array contest, it returns a list of two elements. The first
383 element is as described, the second element is the Math::BigInt
384 representation of the netmask.
385 "$me->contains($other)"
387 Returns true when $me completely contains $other. False is returned
388 otherwise and "undef" is returned if $me and $other are not both
389 "NetAddr::IP::Lite" objects.
390 "$me->within($other)"
392 The complement of "->contains()". Returns true when $me is
393 completely contained within $other, undef if $me and $other are not
394 both "NetAddr::IP::Lite" objects.
395 C->is_rfc1918()>
397 Returns true when $me is an RFC 1918 address.
398 10.0.0.0 - 10.255.255.255 (10/8 prefix)
400 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
401 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
402 "->is_local()"
404 Returns true when $me is a local network address.
405 i.e. ipV4 127.0.0.0 - 127.255.255.255
407 or ipV6 === ::1
408 "->first()"
410 Returns a new object representing the first usable IP address
411 within the subnet (ie, the first host address).
412 "->last()"
414 Returns a new object representing the last usable IP address within
415 the subnet (ie, one less than the broadcast address).
416 "->nth($index)"
418 Returns a new object representing the n-th usable IP address within
419 the subnet (ie, the n-th host address). If no address is available
420 (for example, when the network is too small for $index hosts),
421 "undef" is returned.
422 Version 4.00 of NetAddr::IP and version 1.00 of NetAddr::IP::Lite
424 implements "->nth($index)" and "->num()" exactly as the
425 documentation states. Previous versions behaved slightly
426 differently and not in a consistent manner.
427 To use the old behavior for "->nth($index)" and "->num()":
429 use NetAddr::IP::Lite qw(:old_nth);
431 old behavior:
433 NetAddr::IP->new('10/32')->nth(0) == undef
434 NetAddr::IP->new('10/32')->nth(1) == undef
435 NetAddr::IP->new('10/31')->nth(0) == undef
436 NetAddr::IP->new('10/31')->nth(1) == 10.0.0.1/31
437 NetAddr::IP->new('10/30')->nth(0) == undef
438 NetAddr::IP->new('10/30')->nth(1) == 10.0.0.1/30
439 NetAddr::IP->new('10/30')->nth(2) == 10.0.0.2/30
440 NetAddr::IP->new('10/30')->nth(3) == 10.0.0.3/30
441 Note that in each case, the broadcast address is represented in the
443 output set and that the 'zero'th index is alway undef except for a
444 point-to-point /31 or /127 network where there are exactly two
445 addresses in the network.
446 new behavior:
448 NetAddr::IP->new('10/32')->nth(0) == 10.0.0.0/32
449 NetAddr::IP->new('10.1/32'->nth(0) == 10.0.0.1/32
450 NetAddr::IP->new('10/31')->nth(0) == 10.0.0.0/32
451 NetAddr::IP->new('10/31')->nth(1) == 10.0.0.1/32
452 NetAddr::IP->new('10/30')->nth(0) == 10.0.0.1/30
453 NetAddr::IP->new('10/30')->nth(1) == 10.0.0.2/30
454 NetAddr::IP->new('10/30')->nth(2) == undef
455 Note that a /32 net always has 1 usable address while a /31 has
457 exactly two usable addresses for point-to-point addressing. The
458 first index (0) returns the address immediately following the
459 network address except for a /31 or /127 when it return the network
460 address.
461 "->num()"
463 As of version 4.42 of NetAddr::IP and version 1.27 of
464 NetAddr::IP::Lite a /31 and /127 with return a net num value of 2
465 instead of 0 (zero) for point-to-point networks.
466 Version 4.00 of NetAddr::IP and version 1.00 of NetAddr::IP::Lite
468 return the number of usable IP addresses within the subnet, not
469 counting the broadcast or network address.
470 Previous versions worked only for ipV4 addresses, returned a
472 maximum span of 2**32 and returned the number of IP addresses not
473 counting the broadcast address. (one greater than the new
474 behavior)
475 To use the old behavior for "->nth($index)" and "->num()":
477 use NetAddr::IP::Lite qw(:old_nth);
479 WARNING:
481 NetAddr::IP will calculate and return a numeric string for network
483 ranges as large as 2**128. These values are TEXT strings and perl
484 can treat them as integers for numeric calculations.
485 Perl on 32 bit platforms only handles integer numbers up to 2**32
487 and on 64 bit platforms to 2**64.
488 If you wish to manipulate numeric strings returned by NetAddr::IP
490 that are larger than 2**32 or 2**64, respectively, you must load
491 additional modules such as Math::BigInt, bignum or some similar
492 package to do the integer math.
493
495 Zeros
496 Ones
497 V4mask
498 V4net
499 :aton DEPRECATED
500 :old_nth
501 :upper
502 :lower
503 :nofqdn
504
506 Luis E. Muñoz <luismunoz@cpan.org>, Michael Robinton
507 <michael@bizsystems.com>
508
510 This software comes with the same warranty as perl itself (ie, none),
511 so by using it you accept any and all the liability.
512
514 This software is (c) Luis E. Muñoz, 1999 - 2005
515 and (c) Michael Robinton, 2006 - 2014.
516 All rights reserved.
518 This program is free software; you can redistribute it and/or modify it
520 under the terms of either:
521 a) the GNU General Public License as published by the Free
523 Software Foundation; either version 2, or (at your option) any
524 later version, or
525 b) the "Artistic License" which comes with this distribution.
527 This program is distributed in the hope that it will be useful, but
529 WITHOUT ANY WARRANTY; without even the implied warranty of
530 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See either the
531 GNU General Public License or the Artistic License for more details.
532 You should have received a copy of the Artistic License with this
534 distribution, in the file named "Artistic". If not, I'll be glad to
535 provide one.
536 You should also have received a copy of the GNU General Public License
538 along with this program in the file named "Copying". If not, write to
539 the
540 Free Software Foundation, Inc.,
542 51 Franklin Street, Fifth Floor
543 Boston, MA 02110-1301 USA
544 or visit their web page on the internet at:
546 http://www.gnu.org/copyleft/gpl.html.
548
550 NetAddr::IP(3), NetAddr::IP::Util(3), NetAddr::IP::InetBase(3)
551perl v5.34.0 2021-07-22 Lite(3)