133.11.16.21
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 (29y) +6
- Not on any threat blocklist +5
- Trust score 76 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Network Allocation for 133.11.16.21
- CIDR range
- 133.11.16.0/20
- IP range (int)
- 2,232,094,720 — 2,232,098,815
- Prefix length
- /20
- Organization
- The University of Tokyo
- ASN
- AS2501
- ASN name
- The University of Tokyo
- Location
- Adachi, Tokyo, Japan
- Coordinates
- 35.774700, 139.798900
- Accuracy radius
- 50 km
- Postal code
- 120-0000
- Regional Internet Registry
- APNIC
- Allocated
- 1997-03-01
- Data source(s)
- maxmind_city, maxmind_asn, ipinfo_lite, maxmind_country
- Last updated
- 2026-07-10 00:20:14
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 133.11.16.21?
133.11.16.21 is allocated to The University of Tokyo (AS2501), registered in Adachi, Japan.
Where is 133.11.16.21 located?
The geolocation for 133.11.16.21 maps to Adachi, Japan 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 133.11.16.21 on?
133.11.16.21 belongs to the 133.11.16.0/20 network block announced by AS2501. This range contains 4,096 addresses.
Does 133.11.16.21 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.
