AS101
University of Washington
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Multiple-origin (MOAS) routing anomaly −12
- Academic allocation +6
- Trust score 59 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About University of Washington
The University of Washington is a public research university in Seattle, Washington, United States. Founded in 1861, it is one of the oldest universities on the West Coast.
⚠ 1 MOAS prefix — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS101 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 207.231.240.0/20 | AS101, AS39941 | 2026-07-18 11:37:44 |
Network profile
Source: PeeringDB →Present at 6 internet exchanges: SIX Seattle: MTU 1500, Pacific Wave, NWAX: Primary Peering VLAN, SIX Seattle (Jumbo): MTU 9000, JPIX TOKYO, SpokaneIX
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 209.124.176.0/20 | 4.1K |
14.6%
|
University of Washington | US | — | — |
| 207.231.240.0/21 | 2.0K |
0.0%
|
— | US | — | — |
| 207.231.248.0/22 | 1.0K |
0.0%
|
— | US | — | — |
| 207.231.252.0/23 | 512 |
0.0%
|
— | US | — | — |
| 198.32.195.0/24 | 256 |
38.7%
|
University of Washington | US | — | — |
| 207.231.254.0/24 | 256 |
0.0%
|
— | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS101 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 209.124.184.0/21 | 3,701 | 2026-07-18 10:52:36 |
| 209.124.176.0/20 | 3,694 | 2026-07-18 10:52:36 |
| 207.231.240.0/20 | 3,684 | 2026-07-18 10:52:36 |
| 209.124.176.0/21 | 3,610 | 2026-07-18 10:52:36 |
| 198.32.195.0/24 | 453 | 2026-07-18 09:31:12 |
Frequently Asked Questions
What is AS101?
AS101 is an Autonomous System Number assigned to University of Washington. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS101 announce?
AS101 announces 4.4K IPv4 addresses distributed across 2 routed CIDR prefixes. The network is registered in United States.
Who operates AS101?
AS101 is operated by University of Washington. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS101 registered in?
AS101 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
