AS7018
Operated by ATT-INTERNET4 - AT&T Enterprises, LLC.
Summary
- // analyst note
- Could be a US residential/business subscriber OR a transit path — disambiguate by prefix (consumer ranges vs. infrastructure). Tier-1 backbone, frequently mid-path.
- // security note
- Mixed eyeball + backbone.
About this ASN.
AS7018 is AT&T's flagship US autonomous system, registered under ARIN since July 1996 and now held by AT&T Enterprises, LLC (the legal entity was renamed from AT&T Services Inc. in late 2024). It is a genuinely mixed network: it serves tens of millions of US residential and business access customers while also operating as a settlement-free Tier-1 backbone. In CAIDA AS Rank it sits at #31 globally, with a customer cone of roughly 2,693 ASNs, ~83,701 prefixes, and ~462 million addresses, and an AS degree near 2,323 (about 2,290 customers, 33 peers, and zero providers — transit-free). Its IPv4 footprint is among the largest anywhere, including the legacy 12.0.0.0/8 block, totaling on the order of 89 million addresses. AT&T runs regional siblings for other continents — AS2685 (Canada), AS2686 (EMEA), AS2687 (APAC), AS2688 (LATAM) — plus the largely-consolidated US peering ASN AS7132 and the legacy BellSouth AS6389. For triage, an AS7018 address may be a residential/business subscriber (consumer ranges such as 12.x, 99.x, 172.x with dynamic reassignment) or part of the transit backbone, so disambiguate by prefix; on backbone space, abuse attaches to downstream customers.
- Operator
- AT&T Enterprises, LLC (ARIN OrgId AEL-360; formerly AT&T Services Inc.) [Confirmed] — ARIN RDAP/WHOIS
- Country / RIR
- US, ARIN [Confirmed] — ARIN RDAP
- Allocated
- 1996-07-30 (ARIN ASN RegDate) [Confirmed] — ARIN RDAP
- Org status
- active; legal entity renamed to "AT&T Enterprises, LLC" (ARIN org update 2024-11-22) — att.com
Security/abuse context
mixed eyeball + backbone. Consumer ranges (12.x, 99.x, 172.x) are access with dynamic reassignment; on backbone/transit, abuse attaches to downstream customers. Standard residential dynamic-IP caveat applies. No carrier-specific abuse listing of note as of 2026-06-04
Network & routing
- Network type
- mixed — ISP-eyeball (tens of millions of US subscribers) + Tier-1 transit-backbone (transit-free) [Confirmed] — CAIDA + operator
- Size
- CAIDA AS Rank #31 globally — customer cone ~2,693 ASNs / ~83,701 prefixes / ~461,814,278 addresses; AS degree ~2,323 (~2,290 customers, ~33 peers, 0 providers); ~8,083 IPv4 prefixes total (~89.26M addrs, incl. legacy 12.0.0.0/8), ~207 IPv6 — asrank.caida.org/asns/7018, BigDataCloud (2026-05/06)
- Routing/peering
- transit-free (0 upstreams); ~2,179 peers — bgp.tools; AT&T Global IP Network peering policy
- Notable usage
- large US residential + business access network and Tier-1 backbone — att.com
- Related ASNs
- AS2685 (Canada), AS2686 (EMEA), AS2687 (APAC), AS2688 (LATAM), AS7132 (US peering, mostly consolidated), AS6389 (legacy BellSouth)
- Analyst note
- Could be a US residential/business subscriber OR a transit path — disambiguate by prefix (consumer ranges vs. infrastructure). As a Tier-1 backbone it frequently appears mid-path.
What this network routes.
- 12.0.0.0/8
- 32.0.0.0/9
- 12.0.0.0/9
- 12.128.0.0/9
- 108.192.0.0/10
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- 108.64.0.0/11
- 162.224.0.0/12
- 99.16.0.0/12
- 107.208.0.0/12
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- 104.0.0.0/12
- 12.112.0.0/12
- 12.80.0.0/12
- 172.0.0.0/12
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- 45.16.0.0/12
- 23.112.0.0/12
- 99.32.0.0/12
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- 12.240.0.0/12
- 75.48.0.0/12
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- 76.208.0.0/15
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- 75.20.0.0/15
- 206.170.0.0/15
- 32.250.0.0/15
- 76.242.0.0/15
- 70.134.0.0/15
- 32.244.0.0/15
- 207.104.0.0/15
- 76.239.0.0/16
- 139.125.0.0/16
- 209.184.0.0/16
- 69.211.0.0/16
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- 66.10.0.0/16
- 192.215.0.0/16
- 207.116.0.0/16
- 76.222.0.0/16
- 71.142.0.0/16
- 216.148.0.0/16
- 75.44.0.0/16
- 76.204.0.0/16
- 69.106.0.0/16
- 166.72.0.0/16
- 76.254.0.0/16
- 199.186.0.0/16
- 166.205.0.0/16
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- 134.24.0.0/16
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- 70.250.0.0/16
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- 70.225.0.0/16
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- 129.37.0.0/16
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- 69.210.128.0/17
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- 99.150.128.0/17
- 64.143.0.0/17
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- 71.132.128.0/17
- 99.141.128.0/17
- 70.240.128.0/17
- 206.13.0.0/17
- 70.236.128.0/17
- 99.10.128.0/17
- 70.132.128.0/17
- 70.131.0.0/17
- 71.137.128.0/17
- 69.0.0.0/17
- 68.79.128.0/17
- 71.136.128.0/17
- 99.156.0.0/17
- 71.131.0.0/17
- 69.234.0.0/17
- 139.151.128.0/17
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- 32.70.0.0/22
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- 15.12.72.0/22
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- 204.127.189.0/24
- 141.174.96.0/24
- 216.187.152.0/24
- 192.241.47.0/24
- 216.176.244.0/24
- 198.97.51.0/24
- 207.182.220.0/24
- 192.153.191.0/24
- 199.20.61.0/24
- 192.189.58.0/24
- 198.190.195.0/24
- 141.174.98.0/24
- 192.195.176.0/24
- 157.234.209.0/24
- 198.153.219.0/24
- 199.80.74.0/24
- 192.127.228.0/24
- 107.225.253.0/24
- 207.11.244.0/24
- 157.234.231.0/24
- 2602:300::/24
- 2600:300::/24
- 2600:1700::/28
- 2001:1890::/29
- 2607:10c0::/32
- 2620:ca:e000::/48
- 2620:129:100f::/48
- 2620:a5:2000::/48
- 2620:98:6000::/48
- 2a02:13e0:1::/48
- 2620:59:a000::/48
- 2607:9080:6::/48
- 2620:27:f::/48
- 2620:b1:8000::/48
- 2620:0:f40::/48
Who it talks to.
| ASN | Operator | Role |
|---|---|---|
| AS1299 | TWELVE99 Arelion Sweden AB | upstream |
| AS3356 | LEVEL3 - Level 3 Parent, LLC | upstream |
| AS174 | COGENT-174 - Cogent Communications, LLC | upstream |
| AS2914 | NTT-DATA-2914 - NTT America, Inc. | upstream |
| AS6939 | HURRICANE - Hurricane Electric LLC | upstream |
| AS6762 | SEABONE-NET TELECOM ITALIA SPARKLE S.p.A. | upstream |
| AS3257 | GTT-BACKBONE GTT Communications Inc. | upstream |
| AS3491 | PCCWG-APAC-HK - PCCW Global (HK) Ltd. | upstream |
| AS5511 | Opentransit Orange S.A. | upstream |
| AS6461 | ZAYO-6461 - Zayo Bandwidth | upstream |
| AS6453 | AS6453 - TATA COMMUNICATIONS (AMERICA) INC | upstream |
| AS3320 | DTAG Deutsche Telekom AG | upstream |
| AS12956 | TELXIUS TELEFONICA GLOBAL SOLUTIONS SL | upstream |
| AS6830 | LibertyGlobal Liberty Global Europe Holding B.V. | upstream |
| AS2497 | IIJ - Internet Initiative Japan Inc. | upstream |
| AS701 | UUNET - Verizon Business | upstream |
| AS286 | KPN GTT Communications Inc. | upstream |
| AS60068 | CDN77 Datacamp Limited | upstream |
| AS398143 | TRUESTREAM - Great Lakes Energy Connections Inc. | upstream |
| AS64200 | VIVIDHOSTING - VIVID-HOSTING LLC | upstream |