ASN AS6431 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS6431?

AS6431 is listed under AT&T Enterprises, LLC.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS6431 AT&T Enterprises, LLC | IPGeolocation.io

ASN Lookup Tool

AT&T Enterprises, LLC semail.att.com

US 21 Routes

AS Data

AS6431

AS6431 – AT&T Enterprises, LLC

AS Number	6431
AS Name	ATT-RESEARCH
Organization	AT&T Enterprises, LLC (ael-360)
Country	US
Website	semail.att.com
Number of IPv4 Routes	15
Number of IPv6 Routes	6
ASN type	ISP
Registry	ARIN
Date Allocated	1996-04-12

ASN Intelligence API for production workflows

Use ASN data for AS6431 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
204.178.8.0/21	AS6431	AT&T Enterprises, LLC	AT&T Laboratories	2048
2620:0:f40::/44	AS7018	AT&T Enterprises, LLC	American Registry for Internet Numbers	~19×10²⁴
135.205.128.0/17	AS6431	AT&T Enterprises, LLC	AT&T Services, Inc.	32768
2620:0:f60::/44	AS6431	AT&T Enterprises, LLC	American Registry for Internet Numbers	~19×10²⁴
12.106.34.0/24	AS6431	AT&T Enterprises, LLC	ATT SERVICES INC.	256
135.205.0.0/16	AS6431	AT&T Enterprises, LLC	AT&T Services, Inc.	65536
207.76.218.0/24	AS6431	AT&T Enterprises, LLC	Verizon Business	256
2620:0:f00::/41	AS6431	AT&T Enterprises, LLC	American Registry for Internet Numbers	~155×10²⁴
2620:0:f50::/44	AS6431	AT&T Enterprises, LLC	American Registry for Internet Numbers	~19×10²⁴
135.207.0.0/17	AS6431	AT&T Enterprises, LLC	AT&T Services, Inc.	32768
135.197.0.0/16	AS6431	AT&T Enterprises, LLC	AT&T LABS	65536
192.20.225.0/24	AS6431	AT&T Enterprises, LLC	AT&T Enterprises, LLC	256
135.205.0.0/17	AS6431	AT&T Enterprises, LLC	AT&T Services, Inc.	32768
135.207.0.0/16	AS6431	AT&T Enterprises, LLC	AT&T Services, Inc.	65536
135.197.0.0/17	AS6431	AT&T Enterprises, LLC	AT&T LABS	32768
135.197.128.0/17	AS6431	AT&T Enterprises, LLC	AT&T LABS	32768
12.106.32.0/23	AS6431	AT&T Enterprises, LLC	ATT SERVICES INC.	512
2620:0:f01::/48	AS6431	AT&T Enterprises, LLC	American Registry for Internet Numbers	~1×10²⁴
135.207.128.0/17	AS6431	AT&T Enterprises, LLC	AT&T Services, Inc.	32768
2620:0:f70::/44	AS6431	AT&T Enterprises, LLC	American Registry for Internet Numbers	~19×10²⁴
12.106.35.0/24	AS6431	AT&T Enterprises, LLC	ATT SERVICES INC.	256

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       6431
ASName:         ATT-RESEARCH
ASHandle:       AS6431
RegDate:        1996-04-12
Updated:        2025-03-18
Ref:            https://rdap.arin.net/registry/autnum/6431



OrgName:        AT&T Enterprises, LLC
OrgId:          AEL-360
Address:        208 S. Akard St.
City:           Dallas
StateProv:      TX
PostalCode:     75202
Country:        US
RegDate:        2024-11-22
Updated:        2026-06-05
Ref:            https://rdap.arin.net/registry/entity/AEL-360


OrgAbuseHandle: ABUSE7-ARIN
OrgAbuseName:   abuse
OrgAbusePhone:  +1-919-319-8167 
OrgAbuseEmail:  abuse@att.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE7-ARIN

OrgTechHandle: ICC-ARIN
OrgTechName:   IP Team
OrgTechPhone:  +1-888-876-2382 
OrgTechEmail:  rm-ipspecialist@att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ICC-ARIN

OrgRoutingHandle: ROUTI59-ARIN
OrgRoutingName:   Routing POC
OrgRoutingPhone:  +1-999-999-9999 
OrgRoutingEmail:  routing_poc@att.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI59-ARIN

OrgTechHandle: ZS44-ARIN
OrgTechName:   IPAdmin-ATT Internet Services
OrgTechPhone:  +1-888-510-5545 
OrgTechEmail:  ipadmin@semail.att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ZS44-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "6431",
    "as_handle" : "AS6431",
    "as_name" : "ATT-RESEARCH",
    "tech_contacts" : [ "ICC-ARIN", "ROUTI59-ARIN", "ZS44-ARIN" ],
    "abuse_contacts" : [ "ABUSE7-ARIN" ],
    "date_created" : "1996-04-12",
    "date_updated" : "2025-03-18",
    "source" : "https://rdap.arin.net/registry/autnum/6431"
  } ],
  "organization" : {
    "handle" : "AEL-360",
    "name" : "AT&T Enterprises, LLC",
    "address" : [ "208 S. Akard St.", "Dallas", "TX", "75202", "US" ],
    "street" : "S. Akard St.",
    "city" : "Dallas",
    "state" : "TX",
    "zip_code" : "75202",
    "country" : [ "US" ],
    "date_created" : "2024-11-22",
    "date_updated" : "2026-06-05",
    "source" : "https://rdap.arin.net/registry/entity/AEL-360",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "ICC-ARIN",
    "name" : "IP Team",
    "email" : [ "rm-ipspecialist@att.com" ],
    "phone" : [ "+1-888-876-2382" ],
    "source" : "https://rdap.arin.net/registry/entity/ICC-ARIN"
  }, {
    "handle" : "ROUTI59-ARIN",
    "name" : "Routing POC",
    "email" : [ "routing_poc@att.com" ],
    "phone" : [ "+1-999-999-9999" ],
    "source" : "https://rdap.arin.net/registry/entity/ROUTI59-ARIN"
  }, {
    "handle" : "ZS44-ARIN",
    "name" : "IPAdmin-ATT Internet Services",
    "email" : [ "ipadmin@semail.att.com" ],
    "phone" : [ "+1-888-510-5545" ],
    "source" : "https://rdap.arin.net/registry/entity/ZS44-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "ABUSE7-ARIN",
    "name" : "abuse",
    "email" : [ "abuse@att.net" ],
    "phone" : [ "+1-919-319-8167" ],
    "source" : "https://rdap.arin.net/registry/entity/ABUSE7-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US

Upstreams

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US

Contacts

Email Contacts

routing_poc@att.com ipadmin@semail.att.com rm-ipspecialist@att.com

Abuse Contacts

abuse@att.net