AS4185 — ATTIS-ASN4185

AS4185 announces 28 IPv4 prefixes covering 131,328 addresses and 3 IPv6 prefixes.

About this network

ATTIS-ASN4185 is registered to AT&T Enterprises, LLC. The handle reflects its origin as an AT&T Internet Services network, and it is one of many AS numbers AT&T operates.

What it's used for

• Carrying enterprise and managed-service customer networks rather than acting as one of AT&T's main backbone or consumer-broadband ASNs.
• The announced prefixes are a mix of slices out of AT&T's own 12.0.0.0/8 and several customer-sized /16 blocks, which is the shape of dedicated business internet access and managed hosting rather than a residential eyeball pool.

Notable

• AT&T runs a large family of AS numbers; this one is a secondary member of that family, so its footprint (a couple hundred thousand addresses) is far smaller than AT&T's flagship networks.
• The organization record was updated in a recent corporate reorganization, but the AS number itself has been AT&T-side since the mid-1990s. The low number is genuine, not a reissue to a new holder.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 12.14.12.0/24
• 12.14.14.0/24
• 12.150.176.0/24
• 12.150.186.0/24
• 12.183.71.0/24
• 12.185.4.0/24
• 12.185.7.0/24
• 152.75.0.0/17
• 152.75.130.0/23
• 152.75.132.0/22
• 152.75.136.0/21
• 152.75.144.0/20
• 152.75.160.0/19
• 152.75.192.0/19
• 152.75.224.0/20
• 152.75.240.0/21
• 152.75.248.0/23
• 152.75.251.0/24
• 152.75.255.0/24
• 165.110.0.0/17
• 165.110.128.0/18
• 165.110.192.0/23
• 165.110.196.0/22
• 165.110.200.0/21
• 165.110.208.0/20
• 165.110.224.0/19
• 192.104.54.0/24
• 192.133.125.0/24
• 2602:80a:e000::/44
• 2620:0:610::/48
• 2620:0:6e0::/48

Upstream networks

• AS7018 AT&T Enterprises, LLC

Adjacent networks

• AS7018 AT&T Enterprises, LLC
• AS13979 AT&T Enterprises, LLC

Routing security

• RPKI: 4 valid, 0 invalid and 11 not-found announcements; 10 ROAs.
• ASPA: none published.
• IRR: 13% of announcements registered; 7 route objects.