AT&T COMMUNICATIONS SERVICES INTERNATIONAL INC.

AT&T Services, Inc.
Data as of 2026-08-23
GLEIF verified
Complete entity footprint
5 linked clusters · 4,776 netblocks · 122,159,184 IPv4 addresses · 394 IPv6 prefixes
This organisation's clusters combined by evidence — shared GLEIF corporate family and shared operating domain attdns.com — not name similarity, so genuinely different organisations that share a name are excluded.
View the full entity page →
LEI
549300OKSEZNCA9WAS16
Registered name
AT&T COMMUNICATIONS SERVICES INTERNATIONAL INC.
Jurisdiction
US-DE
Ultimate parent
No parent on file in GLEIF
Cluster stats
Netblocks395 · 14,077,480 IPv4 addresses
IPv6 3 prefixes (largest 2a01:e284::/32)
All fragments 410 blocks across 3 clusters
Cluster ID226908199
RegistryBGP
Owner jurisdictionUS-DE
Customersfind customers using this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 549300OKSEZNCA9WAS16
Shared handles clustered on 24 shared RIR contact/maintainer handles
Registry names 4 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

9 weekly snapshots · JSON
408 +279 netblocks since 2026-07-05
2026-07-05 peak 408 2026-08-23

IP Ranges (395)

showing 50 of 395 — see all — ⬇ export CSV
CIDR Org name Registry Status Confidence
12.0.104.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.0.136.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.0.224.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.1.136.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.2.104.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.11.80.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.11.192.0/19 AT&T Services, Inc. ARIN ALLOCATION ● high
12.11.224.0/20 AT&T Services, Inc. ARIN ALLOCATION ● high
12.11.240.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.11.254.0/23 AT&T Services, Inc. ARIN ALLOCATION ● high
12.14.152.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.15.184.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.17.156.0/22 AT&T Services, Inc. ARIN ALLOCATION ● high
12.17.252.0/22 AT&T Services, Inc. ARIN ALLOCATION ● high
12.19.176.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.19.232.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.22.40.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.102.192.0/18 AT&T Services, Inc. ARIN ALLOCATION ● high
12.104.24.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.105.13.0/24 AT&T Services, Inc. ARIN ALLOCATION ● high
12.105.40.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.105.56.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.105.132.0/22 AT&T Services, Inc. ARIN ALLOCATION ● high
12.106.160.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.106.168.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.107.16.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.108.88.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.110.184.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.110.206.0/23 AT&T Services, Inc. ARIN ALLOCATION ● high
12.111.88.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.111.104.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.111.120.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.124.154.0 – 12.124.255.255 AT&T Services, Inc. ARIN ALLOCATION ● high
12.128.0.0/16 AT&T Services, Inc. ARIN ALLOCATION ● high
12.129.152.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.129.172.0/22 AT&T Services, Inc. ARIN ALLOCATION ● high
12.130.132.0/29 AT&T Services, Inc. ARIN ASSIGNMENT ● high
12.130.132.32/27 AT&T Services, Inc. ARIN ASSIGNMENT ● high
12.132.224.0/19 AT&T Services, Inc. ARIN ALLOCATION ● high
12.139.0.0/16 AT&T Services, Inc. ARIN ALLOCATION ● high
12.144.88.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.144.208.0/20 AT&T Services, Inc. ARIN ALLOCATION ● high
12.145.104.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.145.200.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.145.248.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.146.48.0/20 AT&T Services, Inc. ARIN ALLOCATION ● high
12.146.208.0/20 AT&T Services, Inc. ARIN ALLOCATION ● high
12.147.24.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.147.104.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high
12.147.168.0/21 AT&T Services, Inc. ARIN ALLOCATION ● high

IPv6 ranges (3)

CIDR
2a01:e284::/32
2a01:e285::/32
2a0f:9407::/32

Domains hosted in this network

what's this?
att.net att.com etrade.com uptodate.com mcmaster.com firstnet.com sbc.com unisys.com bcbsm.com att-idns.net attdns.net myfollett.com mfmnow.com pscufs.com gladns.com cennet.com

Corporate group (3 confirmed entities)

Network trust

what's this?
RPKI hygiene: F how networks compare →
17.2% of checked blocks have valid RPKI ROA coverage (70 of 408)
No discrepancies found among checked blocks.

NIC Handles

ABUSE7-ARIN ABUSE7-ARIN AS11712 AS797 ATT-MNT ATTAB-ARIN ATTSE-Z ATTSE-Z ATTW DUMY-RIPE DUMY-RIPE F4-MNT +12 more