128.208.64.100
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
- Long-established allocation (39y) +6
- Not on any threat blocklist +5
- Has a reverse-DNS (PTR) record +5
- Trust score 81 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
DNS records
- Reverse DNS (PTR)
- irb--386.uwer-hsrr-1.infra.washington.edu
- Forward-confirmed (FCrDNS)
- Not checked
- PTR TTL
- 21600 s
- Reverse DNS last checked
- 2026-09-11 23:15 UTC
Forward DNS records for irb--386.uwer-hsrr-1.infra.washington.edu
| Type | Value | Priority | TTL |
|---|---|---|---|
| A | 128.208.64.100 | — | 86400s |
| A | 128.208.64.101 | — | 86400s |
| A | 172.28.64.100 | — | 86400s |
| A | 172.28.64.101 | — | 86400s |
Reverse & forward DNS collected by the WorldIP scanner fleet — FCrDNS confirms the PTR hostname resolves back to this IP.
Network Allocation for 128.208.64.100
- CIDR range
- 128.208.64.0/20
- IP range (int)
- 2,161,131,520 — 2,161,135,615
- Prefix length
- /20
- Organization
- University of Washington
- ASN
- AS73
- ASN name
- University of Washington
- Location
- Edmonds, Washington, United States
- Coordinates
- 47.830200, -122.333100
- Accuracy radius
- 20 km
- Postal code
- 98026
- Regional Internet Registry
- ARIN
- Allocated
- 1987-03-05
- Data source(s)
- maxmind_city, maxmind_asn, ipinfo_lite, maxmind_country
- Last updated
- 2026-09-12 05:53:32
BGP Routing
Live BGP anomalies →Origin AS announcing the most-specific prefix that covers this IP, observed across our RIPE RIS collectors.
Frequently Asked Questions
Who owns 128.208.64.100?
128.208.64.100 is allocated to University of Washington (AS73), registered in Edmonds, United States.
Where is 128.208.64.100 located?
The geolocation for 128.208.64.100 maps to Edmonds, United States based on MaxMind GeoLite2 data. Accuracy depends on the provider and may represent the ISP's regional hub rather than the exact endpoint.
What network is 128.208.64.100 on?
128.208.64.100 belongs to the 128.208.64.0/20 network block announced by AS73. This range contains 4,096 addresses.
Does 128.208.64.100 have a reverse DNS record?
Reverse DNS (PTR) records are resolved live when you visit this page. If a PTR record exists, it appears in the Reverse DNS field above. PTR records map IP addresses back to hostnames and are commonly used for email authentication and network diagnostics.
Neighbors
Other addresses in the same /24.
