Home ASN LookupAS19957

AS19957 STATE-OF-TENNESSEE-NETTN - AT&T Enterprises, LLC

🇺🇸

ARINassigned

Announced Prefixes (BGP)

54total

54 IPv40 IPv6

IPv4 Addresses

Allocated (RIR)131,072

Announced (BGP)436,224

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)0

Prefix Limit (IPv4)

200

Prefix Limit (IPv6)

Country

🇺🇸 US

RIR

ARIN

Status

assigned

Allocated

2003-03-05

Announced Prefixes

(BGP)54

Prefix	RPKI	IRR	Last Seen
12.165.35.0/24MOAS	No ROA	-	2026-10-10
12.204.192.0/20	No ROA	-	2026-10-10
12.204.201.0/24	No ROA	-	2026-10-10
12.204.206.0/24	No ROA	-	2026-10-10
12.204.208.0/20	No ROA	-	2026-10-10
12.204.208.0/24	No ROA	-	2026-10-10
12.204.209.0/24	No ROA	-	2026-10-10
12.204.216.0/21	No ROA	-	2026-10-10
12.230.239.0/24MOAS	No ROA	-	2026-10-10
64.79.176.0/21	No ROA	-	2026-10-10

1-10 of 54

1 / 6

Allocated Prefixes

(RIR)2

Prefix	Country	RIR	Status
198.146.0.0/16	🇺🇸 US	ARIN	allocated
206.23.0.0/16	🇺🇸 US	ARIN	allocated

All 54 announced prefixes of AS19957 →

BGP Neighbours

(seen in AS paths)

Upstreams (2)

Networks AS19957 hands its own prefixes to: transit providers, or peers at an exchange.

AS7018AT&T Enterprises34
AS16473AT&T Enterprises20

Downstreams (1)

Networks whose own prefixes AS19957 passes on: usually its customers.

AS16989The University Of Tennessee Health Science Center2

Transfer History

Registry transfers of AS19957 between organisations.

AS19957M&A · 2024-12-05
AT&T Corp.
🇺🇸 US ARIN
→
AT&T Enterprises, LLC
🇺🇸 US ARIN
AS19957M&A · 2018-09-10
BellSouth.net Inc.
🇺🇸 US ARIN
→
AT&T Corp.
🇺🇸 US ARIN

Date	Resource	From	To	Type
2024-12-05	AS19957	AT&T Corp. 🇺🇸 US ARIN	AT&T Enterprises, LLC 🇺🇸 US ARIN	M&A
2018-09-10	AS19957	BellSouth.net Inc. 🇺🇸 US ARIN	AT&T Corp. 🇺🇸 US ARIN	M&A

ASPA

No ASPA

External Links

ARIN Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS19957 should publish an ASPA object
IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/19957

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/19957" | jq