1Data::Validate::IP(3) User Contributed Perl DocumentationData::Validate::IP(3)
2
6 Data::Validate::IP - IPv4 and IPv6 validation methods
7
9 version 0.30
10
12 use Data::Validate::IP qw(is_ipv4 is_ipv6);
13 my $suspect = '1.2.3.4';
15 if (is_ipv4($suspect)) {
16 print "Looks like an IPv4 address";
17 }
18 else {
19 print "Not an IPv4 address\n";
20 }
21 $suspect = '::1234';
23 if (is_ipv6($suspect)) {
24 print "Looks like an IPv6 address";
25 }
26 else {
27 print "Not an IPv6 address\n";
28 }
29
31 This module provides a number IP address validation subs that both
32 validate and untaint their input. This includes both basic validation
33 ("is_ipv4()" and "is_ipv6()") and special cases like checking whether
34 an address belongs to a specific network or whether an address is
35 public or private (reserved).
36
38 It's important to understand that if "is_ipv4($ip)", "is_ipv6($ip)", or
39 "is_ip($ip)" return false, then all other validation functions for that
40 IP address family will also return false. So for example, if
41 "is_ipv4($ip)" returns false, then "is_private_ipv4($ip)" and
42 "is_public_ipv4($ip)" will both also return false.
43 This means that simply calling "is_private_ipv4($ip)" by itself is not
45 sufficient if you are dealing with untrusted input. You should always
46 check "is_ipv4($ip)" as well. This applies as well when using IPv6
47 functions or generic functions like "is_private_ip($ip)".
48 There are security implications to this around certain oddly formed
50 addresses. Notably, an address like "010.0.0.1" is technically valid,
51 but the operating system will treat "010" as an octal number. That
52 means that "010.0.0.1" is equivalent to "8.0.0.1", not "10.0.0.1".
53 However, this module's "is_ipv4($ip)" and "is_ip($ip)" functions will
55 return false for addresses like "010.0.0.1" which have octal
56 components. And of course that means that it also returns false for
57 "is_private_ipv4($ip)" and "is_public_ipv4($ip)".
58
60 All of the functions below are exported by default.
61 All functions return an untainted value if the test passes and undef if
63 it fails. In theory, this means that you should always check for a
64 defined status explicitly but in practice there are no valid IP
65 addresses where the string form evaluates to false in Perl.
66 Note that none of these functions actually attempt to test whether the
68 given IP address is routable from your device; they are purely semantic
69 checks.
70 is_ipv4($ip), is_ipv6($ip), is_ip($ip)
72 These functions simply check whether the address is a valid IPv4 or
73 IPv6 address.
74 is_innet_ipv4($ip, $network)
76 This subroutine checks whether the address belongs to the given IPv4
77 network. The $network argument can either be a string in CIDR notation
78 like "15.0.15.0/24" or a NetAddr::IP object.
79 This subroutine used to accept many more forms of network
81 specifications (anything Net::Netmask accepts) but this has been
82 deprecated.
83 is_unroutable_ipv4($ip)
85 This subroutine checks whether the address belongs to any of several
86 special use IPv4 networks - "0.0.0.0/8", "100.64.0.0/10",
87 "192.0.0.0/29", "198.18.0.0/15", "240.0.0.0/4" - as defined by RFC 5735
88 <http://tools.ietf.org/html/rfc5735>, RFC 6333
89 <http://tools.ietf.org/html/rfc6333>, and RFC 6958
90 <http://tools.ietf.org/html/rfc6598>.
91 Arguably, these should be broken down further but this subroutine will
93 always exist for backwards compatibility.
94 is_private_ipv4($ip)
96 This subroutine checks whether the address belongs to any of the
97 private IPv4 networks - "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"
98 - as defined by RFC 5735 <http://tools.ietf.org/html/rfc5735>.
99 is_loopback_ipv4($ip)
101 This subroutine checks whether the address belongs to the IPv4 loopback
102 network - "127.0.0.0/8" - as defined by RFC 5735
103 <http://tools.ietf.org/html/rfc5735>.
104 is_linklocal_ipv4($ip)
106 This subroutine checks whether the address belongs to the IPv4 link
107 local network - "169.254.0.0/16" - as defined by RFC 5735
108 <http://tools.ietf.org/html/rfc5735>.
109 is_testnet_ipv4($ip)
111 This subroutine checks whether the address belongs to any of the IPv4
112 TEST-NET networks for use in documentation and example code -
113 "192.0.2.0/24", "198.51.100.0/24", and "203.0.113.0/24" - as defined by
114 RFC 5735 <http://tools.ietf.org/html/rfc5735>.
115 is_anycast_ipv4($ip)
117 This subroutine checks whether the address belongs to the 6to4 relay
118 anycast network - "192.88.99.0/24" - as defined by RFC 5735
119 <http://tools.ietf.org/html/rfc5735>.
120 is_multicast_ipv4($ip)
122 This subroutine checks whether the address belongs to the IPv4
123 multicast network - "224.0.0.0/4" - as defined by RFC 5735
124 <http://tools.ietf.org/html/rfc5735>.
125 is_loopback_ipv6($ip)
127 This subroutine checks whether the address is the IPv6 loopback address
128 - "::1/128" - as defined by RFC 4291
129 <http://tools.ietf.org/html/rfc4291>.
130 is_ipv4_mapped_ipv6($ip)
132 This subroutine checks whether the address belongs to the IPv6
133 IPv4-mapped address network - "::ffff:0:0/96" - as defined by RFC 4291
134 <http://tools.ietf.org/html/rfc4291>.
135 is_discard_ipv6($ip)
137 This subroutine checks whether the address belongs to the IPv6 discard
138 prefix network - "100::/64" - as defined by RFC 6666
139 <http://tools.ietf.org/html/rfc6666>.
140 is_special_ipv6($ip)
142 This subroutine checks whether the address belongs to the IPv6 special
143 network - "2001::/23" - as defined by RFC 2928
144 <http://tools.ietf.org/html/rfc2928>.
145 is_teredo_ipv6($ip)
147 This subroutine checks whether the address belongs to the IPv6 TEREDO
148 network - "2001::/32" - as defined by RFC 4380
149 <http://tools.ietf.org/html/rfc4380>.
150 Note that this network is a subnet of the larger special network at
152 "2001::/23".
153 is_orchid_ipv6($ip)
155 This subroutine checks whether the address belongs to the IPv6 ORCHID
156 network - "2001::/32" - as defined by RFC 4380
157 <http://tools.ietf.org/html/rfc4380>.
158 Note that this network is a subnet of the larger special network at
160 "2001::/23".
161 This network is currently scheduled to be returned to the special pool
163 in March of 2014 unless the IETF extends its use. If that happens this
164 subroutine will continue to exist but will always return false.
165 is_documentation_ipv6($ip)
167 This subroutine checks whether the address belongs to the IPv6
168 documentation network - "2001:DB8::/32" - as defined by RFC 3849
169 <http://tools.ietf.org/html/rfc3849>.
170 is_private_ipv6($ip)
172 This subroutine checks whether the address belongs to the IPv6 private
173 network - "FC00::/7" - as defined by RFC 4193
174 <http://tools.ietf.org/html/rfc4193>.
175 is_linklocal_ipv6($ip)
177 This subroutine checks whether the address belongs to the IPv6 link-
178 local unicast network - "FE80::/10" - as defined by RFC 4291
179 <http://tools.ietf.org/html/rfc4291>.
180 is_multicast_ipv6($ip)
182 This subroutine checks whether the address belongs to the IPv6
183 multicast network - "FF00::/8" - as defined by RFC 4291
184 <http://tools.ietf.org/html/rfc4291>.
185 is_public_ipv4($ip), is_public_ipv6($ip), is_public_ip($ip)
187 These subroutines check whether the given IP address belongs to any of
188 the special case networks defined previously. Note that this is not
189 simply the opposite of checking "is_private_ipv4()" or
190 "is_private_ipv6()". The private networks are a subset of all the
191 special case networks.
192 is_linklocal_ip($ip)
194 This subroutine checks whether the address belongs to the IPv4 or IPv6
195 link-local unicast network.
196 is_loopback_ip($ip)
198 This subroutine checks whether the address is the IPv4 or IPv6 loopback
199 address.
200 is_multicast_ip($ip)
202 This subroutine checks whether the address belongs to the IPv4 or IPv6
203 multicast network.
204 is_private_ip($ip)
206 This subroutine checks whether the address belongs to the IPv4 or IPv6
207 private network.
208
210 This module can also be used as a class. You can call
211 "Data::Validate::IP->new()" to get an object and then call any of the
212 validation subroutines as methods on that object. This is somewhat
213 pointless since the object will never contain any state but this
214 interface is kept for backwards compatibility.
215
217 IPv4
218 [RFC 5735] [RFC 1918]
220 IPv6
222 [RFC 2460] [RFC 4193] [RFC 4291] [RFC 6434]
224
226 Thanks to Richard Sonnen <sonnen@richardsonnen.com> for writing the
227 Data::Validate module.
228 Thanks to Matt Dainty <matt@bodgit-n-scarper.com> for adding the
230 "is_multicast_ipv4()" and "is_linklocal_ipv4()" code.
231
233 Please report any bugs or feature requests to
234 "bug-data-validate-ip@rt.cpan.org", or through the web interface at
235 <http://rt.cpan.org>. I will be notified, and then you'll automatically
236 be notified of progress on your bug as I make changes.
237 Bugs may be submitted at
239 <https://github.com/houseabsolute/Data-Validate-IP/issues>.
240
242 The source code repository for Data-Validate-IP can be found at
243 <https://github.com/houseabsolute/Data-Validate-IP>.
244
246 • Neil Neely <neil@neely.cx>
247 • Dave Rolsky <autarch@urth.org>
249
251 Gregory Oschwald <goschwald@maxmind.com>
252
254 This software is copyright (c) 2021 by Neil Neely.
255 This is free software; you can redistribute it and/or modify it under
257 the same terms as the Perl 5 programming language system itself.
258 The full text of the license can be found in the LICENSE file included
260 with this distribution.
261perl v5.34.0 2021-07-22 Data::Validate::IP(3)