AS20057 — ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC(US)

Nutrition Label

Routing footprint

AS20057 announces 1,623 distinct routed prefixes. The 25-prefix sample below links to per-prefix pages with full conflict and reverse-DNS detail.

• 12.72.0.0/19
• 12.72.32.0/21
• 12.72.40.0/21
• 12.72.48.0/21
• 12.72.56.0/21
• 12.72.0.0/17
• 12.72.64.0/22
• 12.72.68.0/22
• 12.72.72.0/22
• 12.72.76.0/23
• 12.72.82.0/23
• 12.72.86.0/24
• 12.72.88.0/23
• 12.72.90.0/23
• 12.72.92.0/22
• 12.72.96.0/22
• 12.72.100.0/23
• 12.72.102.0/24
• 12.72.104.0/21
• 12.72.113.0/24
• 12.72.114.0/23
• 12.72.116.0/23
• 12.72.119.0/24
• 12.72.120.0/24
• 12.72.122.0/24

Peering ecosystem

2 distinct peers via BGP. The first 2 are listed below.

Blast radius

Approximate count of dependent hostnames if AS20057 disappeared from the routing table.

~18,124,690 hostnames depend on this network.Sampled from 10 prefixes, snapshot Thu, 21 May 2026 06:32:40 GMT.

MOAS / hijack watch

Prefixes routed by AS20057 that another Autonomous System also announces. A non-empty list is one of the strongest BGP-hijack signals available without active probes.

No active MOAS conflicts. Every prefix announced by AS20057 is unique to AS20057 in the current routing snapshot.

Threat posture

Related pages

Pivot deeper into the graph from AS20057.

• Country · US
• Peer · ATT-INTERNET4 - AT&T Enterprises, LLCAS7018
• Prefix · 12.72.0.0/19
• Live MOAS conflicts feed
• Threat feed · Spamhaus DROP
• Whisper Internet Directory — home

Cypher and MCP

Reproduce the headline metric directly against graph.whisper.security:

MATCH (a:ASN {name: "AS20057"})-[:HAS_NAME]->(n:ASN_NAME)
OPTIONAL MATCH (a)-[:HAS_COUNTRY]->(c:COUNTRY)
RETURN a.name AS asn, n.name AS operator, c.name AS country

Or query Whisper from your own LLM workflow via the Whisper MCP server.