Home ASN LookupAS4185

AS4185 ATTIS-ASN4185 - AT&T Enterprises, LLC

🇺🇸

ARINassigned

Announced Prefixes (BGP)

20total

14 IPv46 IPv6

IPv4 Addresses

Allocated (RIR)131,584

Announced (BGP)199,424

IPv6 Addresses

Allocated (RIR)2.1×10²⁵

Announced (BGP)2.5×10²⁵

Prefix Limit (IPv4)

200

Prefix Limit (IPv6)

Country

🇺🇸 US

RIR

ARIN

Status

assigned

Allocated

1994-12-16

Routing hygiene

Score 53/100 · High risk

RPKI ROA coverage

35%

no RPKI invalid prefixes

IRR route objects

10%

8 prefixes registered for another origin

Hijack signals

0 announced against others' ROAs, 0 own announced by others

Upstreams

diversity 0/100

65% of announced prefixes (13 of 20) have no valid ROA
90% of announced prefixes (18 of 20) have no IRR route object for this ASN
1 prefix registered in IRR route objects for another active network and not authorized by a ROA
Only one upstream seen in the AS paths of its routes

Based on 20 announced prefixes, updated daily (2026-10-24). How the score works · RPKI explained

Announced Prefixes

(BGP)20

Prefix	RPKI	IRR	Last Seen
12.14.12.0/24	No ROA	-	2026-10-26
12.14.14.0/24	No ROA	-	2026-10-26
12.150.176.0/24	No ROA	-	2026-10-26
12.150.186.0/24	No ROA	-	2026-10-26
12.183.71.0/24	No ROA	-	2026-10-26
12.185.4.0/24	No ROA	-	2026-10-26
12.185.7.0/24	No ROA	-	2026-10-26
148.184.0.0/16	No ROA	-	2026-10-26
152.75.0.0/16	No ROA	-	2026-10-26
152.75.221.0/24	No ROA	-	2026-10-26

1-10 of 20

1 / 2

Allocated Prefixes

(RIR)7

Prefix	Country	RIR	Status
152.75.0.0/16	🇺🇸 US	ARIN	allocated
165.110.0.0/16	🇺🇸 US	ARIN	allocated
192.104.54.0/24	🇺🇸 US	ARIN	allocated
192.133.125.0/24	🇺🇸 US	ARIN	allocated
2602:80a:e000::/44	🇺🇸 US	ARIN	allocated
2620:0:6e0::/48	🇺🇸 US	ARIN	allocated
2620:0:900::/48	-	ARIN	reserved

All 20 announced prefixes of AS4185 →

Downstream Customers(1)

ASN	Name
AS401953	🇺🇸SBA1DC - U.S. Small Business Administration

BGP Neighbours

(seen in AS paths)

Upstreams (1)

Networks AS4185 hands its own prefixes to: transit providers, or peers at an exchange.

AS7018AT&T Enterprises20

Other adjacent networks (1)

Adjacent to AS4185 in the transit part of AS paths: peers, providers or customers.

AS13979AT&T Enterprises8

Transfer History

Registry transfers of AS4185 between organisations.

AS4185M&A · 2024-12-05
AT&T Corp.
🇺🇸 US ARIN
→
AT&T Enterprises, LLC
🇺🇸 US ARIN
AS4185M&A · 2018-07-18
AT&T Internet Services
🇺🇸 US ARIN
→
AT&T Corp.
🇺🇸 US ARIN

Date	Resource	From	To	Type
2024-12-05	AS4185	AT&T Corp. 🇺🇸 US ARIN	AT&T Enterprises, LLC 🇺🇸 US ARIN	M&A
2018-07-18	AS4185	AT&T Internet Services 🇺🇸 US ARIN	AT&T Corp. 🇺🇸 US ARIN	M&A

ASPA

No ASPA0 upstreams, 1 downstream

Listed as Upstream Provider by

1 ASN

View full ASPA details →

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
How to run an ASPA checkVerify the upstream providers listed above
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/4185

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

curl -s "https://api.ipctl.io/v1/asn/4185" | jq