subnet.im

AS20057AT&T Enterprises, LLC

United StatesRegistryARINTypeEyeball

As of 11th November 2026, AS20057 (AT&T Enterprises, LLC), an access network registered in the United States with ARIN, originates 1,472 IPv4 prefixes covering 6.6M addresses and 161 IPv6 prefixes. By IPv4 address space that makes it the 113th-largest of the 80,747 networks we see originating IPv4, and the 34th-largest of 18,752 in the United States. It is seen behind 1 upstream network, most often AS7018 (AT&T Enterprises, LLC), and in front of 1 downstream network. 89% of its announcements have a valid RPKI ROA; 23 are RPKI-invalid. 99% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

1,472

IPv6 prefixes

161

IPv4 addresses

6.6M

IPv6 /64s

3.9B

Upstream graph

The networks AS20057 is seen behind, one and two hops out, drawn from real AS paths.

AS20057Toward the internet core
Upstream graph for AS20057: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS20057AT&T Enterprises,…This networkAS7018AT&T Enterprises,…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS20057 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

4

adjacent networks

Upstreams
125%
Peers
250%
Downstreams
125%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS20057
NetworkCountryRelationshipPathsVantage pts
AS7018AT&T Enterprises, LLCUSPeer123,604138

Prefixes

All 1,633

The largest blocks AS20057 originates, widest first.

Largest prefixes originated by AS20057
PrefixAddressesVisibility
166.128.0.0/14262k76/76
166.132.0.0/14262k76/76
107.84.0.0/15131k76/76
166.134.0.0/15131k76/76
166.184.0.0/15131k76/76
166.212.0.0/15131k76/76
166.218.0.0/15131k76/76
107.80.0.0/1665.5k76/76
107.232.0.0/1665.5k4/76
107.233.0.0/1665.5k76/76

Routing health

How AS20057's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid88.6%1,447
  • Invalid1.4%23
  • No ROA10.0%163

Propagation

  • Globally propagated90% of full-feed peers or more98.5%1,609
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%1.5%24

Prefix sizes

IPv4 — 1,472 prefixes

IPv6 — 161 prefixes

  • /37134M × /644.3%7
  • /3867.1M × /6415.5%25
  • /3933.6M × /640.6%1
  • /4016.8M × /6428.6%46
  • /418.4M × /6437.9%61
  • /441M × /642.5%4
  • /46262k × /642.5%4
  • /4865.5k × /648.1%13

Recent changes

Announcements that started or stopped since 12th Oct 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.