<?php

$input = <<<EOD
inetnum:        81.25.48.0 - 81.25.51.255
netname:        UltraNet-Main-Net
descr:          JSC Lan-Telecom
country:        RU
admin-c:        XL-RIPE
tech-c:         XL-RIPE
status:         ASSIGNED PA
mnt-by:         LAN-TELECOM-MNT
mnt-lower:      LAN-TELECOM-MNT
mnt-routes:     LAN-TELECOM-MNT
source:         RIPE #Filtered

person:         Konstantin A Ploshenko
address:        Lavochkina str., 34
address:        125581, Moscow, Russia
phone:          +7 495 2589110
fax-no:         +7 495 2589110
nic-hdl:        XL-RIPE
source:         RIPE #Filtered
mnt-by:         XL-MNT

% Information related to '81.25.48.0/22AS39463'
route:          81.25.48.0/22
descr:          JSC Lan-Telecom
origin:         AS39463
mnt-by:         LAN-TELECOM-MNT
source:         RIPE #Filtered

EOD;

$regexp = '/address:\s*(.*)/';
preg_match_all ($regexp, $input, $matches);
foreach($matches[1] as $match) {
    echo $match, PHP_EOL;
}