Home ASN LookupAS101

AS101 WASH-NSF-AS - University of Washington

🇺🇸

ARINassigned

Announced Prefixes (BGP)

13total

8 IPv45 IPv6

IPv4 Addresses

Allocated (RIR)8,192

Announced (BGP)13,312

IPv6 Addresses

Allocated (RIR)7.9×10²⁸

Announced (BGP)1.3×10²⁹

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

🇺🇸 US

RIR

ARIN

Status

assigned

Allocated

1987-03-31

Routing hygiene

Score 7/100 · Low risk

RPKI ROA coverage

100%

no RPKI invalid prefixes

IRR route objects

100%

no origin mismatches

Hijack signals

0 announced against others' ROAs, 5 own announced by others

Upstreams

diversity 80/100

5 prefixes of this ASN announced by another network against its ROAs

Based on 13 announced prefixes, updated daily (2026-10-25). How the score works · RPKI explained

Announced Prefixes

(BGP)13

Prefix	RPKI	IRR	Last Seen
207.231.240.0/20MOAS	Valid	Other IRR	2026-10-26
207.231.241.0/24	Valid	-	2026-10-26
207.231.243.0/24MOAS	Valid	-	2026-10-26
207.231.245.0/24MOAS	Valid	-	2026-10-26
207.231.248.0/24MOAS	Valid	-	2026-10-26
209.124.176.0/20	Valid	Other IRR	2026-10-26
209.124.176.0/21	Valid	Other IRR	2026-10-26
209.124.184.0/21	Valid	Other IRR	2026-10-26
2001:504:b::/48MOAS	Valid	Other IRR	2026-10-26
2001:1860::/32	Valid	Other IRR	2026-10-26

1-10 of 13

1 / 2

Allocated Prefixes

(RIR)4

Prefix	Country	RIR	Status
207.231.240.0/20	🇺🇸 US	ARIN	allocated
209.124.176.0/20	🇺🇸 US	ARIN	allocated
2001:504:b::/48	🇺🇸 US	ARIN	allocated
2001:1860::/32	🇺🇸 US	ARIN	allocated

All 13 announced prefixes of AS101 →

Downstream Customers(3)

ASN	Name
AS11649	🇺🇸GUNET - Gonzaga University
AS54027	🇺🇸SEATTLE-PUBLIC-SCHOOLS - Seattle Public Schools
AS54429	🇺🇸LOCAL-CONNECTIVITY-LAB - Local Connectivity Lab

BGP Neighbours

(seen in AS paths)

Upstreams (7)

Networks AS101 hands its own prefixes to: transit providers, or peers at an exchange.

AS174Cogent Communications5
AS6360University Of Hawaii2
AS7575Australian Academic And Research Network (AARNet)2
AS2907Research Organization Of Information And Systems, National Institute Of Informatics1
AS3356Level 3 Parent1
AS6939Hurricane Electric1
AS11537Internet21

Downstreams (15)

Networks whose own prefixes AS101 passes on: usually its customers.

AS10430Washington State K 20 Telecommunications Network97
AS3807University Of Montana30
AS73University Of Washington11
AS17200Seattle Community College District5
AS13476Montana State University4
AS54429Local Connectivity Lab4
AS4193State Of Washington2
AS11548Heritage University2
AS14221University Of Washington2
AS14954The Fred Hutchinson Cancer Research Center2
AS19014NORCOM2
AS39941Pacific Wave2
AS7774University Of Alaska1
AS40272Allen Institute1
AS53472City Of Kirkland Washington1

Other adjacent networks (5)

Adjacent to AS101 in the transit part of AS paths: peers, providers or customers.

AS11956National Oceanic And Atmospheric Administration7
AS6509CANARIE3
AS38022REANNZ National Research And Education Network2
AS11164Internet21
AS22335Metropolitan Research And Education Network1

ASPA

No ASPA0 upstreams, 3 downstreams

Listed as Upstream Provider by

3 ASNs

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/101

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

curl -s "https://api.ipctl.io/v1/asn/101" | jq