Bug #75715 [Com]: ip2long

Edit report at https://bugs.php.net/bug.php?id=75715&edit=1 ID: 75715 Comment by: igronus at gmail dot com Reported by: igronus at gmail dot com Summary: ip2long Status: Feedback Type: Bug Package: Unknown/Other Function PHP Version: 7.1.12 Block user comment: N Private report: N New Comment: It is legal: https://en.wikipedia.org/wiki/IPv4#Addresses_ending_in_0_or_255 However, I think it should be mentioned in documentation because some devices and software can't work with such ip-addresses. Previous Comments: ------------------------------------------------------------------------ [2017-12-21 16:10:27] levim@php.net According to https://serverfault.com/a/10989/100096: > It depends on the subnet of the IP address in question. In general, the first and last > addresses in a subnet are used as the network identifier and broadcast address, respectively. All > other addresses in the subnet can be assigned to hosts on that subnet. > For example, IP addresses of networks with subnet masks of at least 24 bits ending in .0 or > .255 can never be assigned to hosts. Such "last" addresses of a subnet are considered > "broadcast" addresses and all hosts on the corresponding subnet will respond to it. > Theoretically, there could be situations where you can assign an address ending in .0: for > example, if you have a subnet like 192.168.0.0/255.255.0.0, you are allowed to assign a host the > address 192.168.1.0. It could create confusion though, so it's not a very common practice. > In your example 10.6.43.0 with subnet 255.255.252.0 (22 bit subnet mask) means subnet ID 10.6.40.0, a host address range from 10.6.40.1 to 10.6.43.254 and a broadcast address 10.6.43.255. So in theory, your example 10.6.43.0 would be allowed as a valid host address. Server Fault is not necessarily authoritative and I am not a subject expert. Can you provide a link to an RFC or some other authoritative source indicating it is not permitted? Otherwise I will close this as not-a-bug. ------------------------------------------------------------------------ [2017-12-21 16:01:26] igronus at gmail dot com Description: ------------ Function ip2long (and filter_var with second argument FILTER_VALIDATE_IP too) doesn't return false when argument is ip-address with zero in last octet (127.0.0.0 for example). However this argument is non-valid ip-address. Test script: --------------- $ip = '192.168.0.0'; var_dump(ip2long($ip)); var_dump(filter_var($ip, FILTER_VALIDATE_IP)); Expected result: ---------------- It must return false in both cases. Actual result: -------------- int(3232235520) string(11) "192.168.0.0" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75715&edit=1