How to check an IP address is within a range of two IPs in PHP? - with ipv6 support -


this duplicate of question: how check ip address within range of 2 ips in php?

however solution above question not support ipv6. there similar solution ipv6 support?

suggestions:

string inet_ntop ( string $in_addr )

this function converts 32bit ipv4, or 128bit ipv6 address (if php built ipv6 support enabled) address family appropriate string representation.

you should see,

string inet_pton ( string $address )

inet_ntop() example

<?php $packed = chr(127) . chr(0) . chr(0) . chr(1); $expanded = inet_ntop($packed);  /* outputs: 127.0.0.1 */ echo $expanded;  $packed = str_repeat(chr(0), 15) . chr(1); $expanded = inet_ntop($packed);  /* outputs: ::1 */ echo $expanded; ?>

comparing in range

the following 2 functions introduced in php 5.1.0, inet_pton , inet_pton. purpose convert human readable ip addresses packed in_addr representation. since result not pure binary, need use unpack function in order apply bitwise operators.

both functions support ipv6 ipv4. difference how unpack address results. ipv6, unpack contents a16, , ipv4, unpack a4.

to put previous in perspective here little sample output clarify:

// our example ip's $ip4= "10.22.99.129"; $ip6= "fe80:1:2:3:a:bad:1dea:dad";   // ip2long examples var_dump( ip2long($ip4) ); // int(169239425) var_dump( ip2long($ip6) ); // bool(false)   // inet_pton examples var_dump( inet_pton( $ip4 ) ); // string(4) var_dump( inet_pton( $ip6 ) ); // string(16)

we demonstrate above inet_* family supports both ipv6 , v4. our next step translate packed result unpacked variable.

// unpacking , packing $_u4 = current( unpack( "a4", inet_pton( $ip4 ) ) ); var_dump( inet_ntop( pack( "a4", $_u4 ) ) ); // string(12) "10.22.99.129"   $_u6 = current( unpack( "a16", inet_pton( $ip6 ) ) ); var_dump( inet_ntop( pack( "a16", $_u6 ) ) ); //string(25) "fe80:1:2:3:a:bad:1dea:dad"

note : current function returns first index of array. equivelant saying $array[0].

after unpacking , packing, can see achieved same result input. simple proof of concept ensure not losing data.

finally use,

if ($ip <= $high_ip && $low_ip <= $ip) {   echo "in range"; }

reference: php.net


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