Nic moc uzitocne, skor len pre chcilu usmevu. IPcky idu zadavat aj v inych formach ako decimal dotted:

woody@alteria:~$ ping -c 1 0x51593903
PING 0x51593903 (81.89.57.3) 56(84) bytes of data.
64 bytes from 81.89.57.3: icmp_seq=1 ttl=61 time=1.53 ms

--- 0x51593903 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.538/1.538/1.538/0.000 ms

woody@alteria:~$ ping -c 1 0121.0131.071.03
PING 0121.0131.071.03 (81.89.57.3) 56(84) bytes of data.
64 bytes from 81.89.57.3: icmp_seq=1 ttl=61 time=1.56 ms

--- 0121.0131.071.03 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.562/1.562/1.562/0.000 ms

woody@alteria:~$ ping -c 1 1364801795
PING 1364801795 (81.89.57.3) 56(84) bytes of data.
64 bytes from 81.89.57.3: icmp_seq=1 ttl=61 time=1.54 ms

--- 1364801795 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.544/1.544/1.544/0.000 ms

woody@alteria:~$ ping -c 1 012126234403
PING 012126234403 (81.89.57.3) 56(84) bytes of data.
64 bytes from 81.89.57.3: icmp_seq=1 ttl=61 time=1.57 ms

--- 012126234403 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.575/1.575/1.575/0.000 ms


FF(2) prijme otal dotted, decimal undotted aj octal undotted, hexa neprijme.
Apache2 odpoeda korektne na octal dotted, na octal undotted a decimal undotted odpoveda tiez ale povie Bad request.

A samozrejme neprehliadnite nie az tak velmi skrytu reklamu na nasu super korporaciu :)