Forse ti riferisci al blocco di indirizzi IP su cui un sito sta?

Per esmepio www.html.it sta su 212.110.13.99

che fa parte del blocco: 212.110.13.96 - 212.110.13.103

dal whoi di Ripe si ottiene:

inetnum: 212.110.13.96 - 212.110.13.103
netname: Html-NET
descr: HTML..it Srl
descr: Via dei Berio 81 ROMA
country: IT
admin-c: GR240-RIPE
tech-c: GR240-RIPE
tech-c: HSI10-RIPE
status: ASSIGNED PA
notify: noc@swisscom-italy.com
mnt-by: IT-SWISSCOM-MNT
changed: noc@grapesnet.com 20011218
source: RIPE

route: 212.110.0.0/19
descr: Grapes Network Services S.p.A.
descr: Milan, Italy
origin: AS8736
mnt-by: IT-SWISSCOM-MNT
changed: hall@ip-plus.net 19990315
changed: marco.zacchello@grapesnet.com 20020521
source: RIPE

role: Hostmaster Swisscom Italy
address: Grapes Network Services S.p.A.
address: Via Caldera 21
address: 20100 Milano
address: Italia
phone: +39 02409341
e-mail: noc@grapesnet.com
trouble: noc@grapesnet.com
admin-c: BT1652-RIPE
tech-c: GR240-RIPE
tech-c: MZ3919-RIPE
tech-c: BT1652-RIPE
tech-c: ST6260-RIPE
tech-c: AR11808-RIPE
nic-hdl: HSI10-RIPE
notify: noc@grapesnet.com
mnt-by: IT-SWISSCOM-MNT
changed: noc@grapesnet.com 20011130
source: RIPE

person: Groppo Rete
address: Grapes Network Services S.p.A.
address: Via Caldera,21
address: Milano Italy - 20153
phone: +39 02 389041
fax-no: +39 02 38904934
e-mail: noc@grapesnet.com
nic-hdl: GR240-RIPE
changed: hostmaster@nic.it 20011217
source: RIPE

E si apische che il blocco è assegnato ad HTML srl da fa parte del blocco più grande 212.110.0.0/19 di proprietà di Grapes Network Services S.p.A.

Forse questo volevi sapere?