AS4473 — ATTIS-ASN4473

AS4473 announces 21 IPv4 prefixes covering 78,336 addresses and 0 IPv6 prefixes.

About this network

ATTIS-ASN4473 — an AT&T Internet Services autonomous system, registered with ARIN in 1995 and held today by AT&T Enterprises, LLC.

What it's used for

• Announcing several dozen AT&T prefixes, largely carved out of AT&T's legacy 12.0.0.0/8, for enterprise and managed customer networks.
• One of many ASNs AT&T maintains alongside its main backbone (AS7018) for specific service segments.

Notable

• Business address space, not consumer broadband: the /24s here look like customer and service assignments rather than subscriber pools.
• The wide spread of small prefixes is typical of an ASN used to originate enterprise customer routes out of a carrier's own aggregate.

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

Announced prefixes

• 12.17.241.0/24
• 12.29.116.0/22
• 12.71.77.0/24
• 12.96.45.0/24
• 12.96.46.0/24
• 12.97.148.0/24
• 12.105.210.0/24
• 12.226.120.0/22
• 151.107.0.0/20
• 165.13.0.0/16
• 198.183.168.0/24
• 206.197.1.0/24
• 207.140.216.0/23
• 207.140.220.0/22
• 209.37.104.0/22
• 209.37.109.0/24
• 209.37.110.0/24
• 209.65.8.0/23
• 209.65.160.0/23
• 209.65.163.0/24
• 209.65.164.0/24

Upstream networks

• AS7018 AT&T Enterprises, LLC

Adjacent networks

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

Routing security

• RPKI: 0 valid, 0 invalid and 32 not-found announcements; 5 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 4 route objects.
• Listed in as-sets: AS-LINKAGE.