133.31.0.238
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 133.31.0.238
- CIDR range
- 133.31.0.0/20
- IP range (int)
- 2,233,401,344 — 2,233,405,439
- Prefix length
- /20
- Organization
- Tokyo University of Science
- ASN
- AS55390
- ASN name
- Tokyo University of Science
- Location
- Matsuyama, Tokyo, Japan
- Coordinates
- 35.777500, 139.513400
- Accuracy radius
- 20 km
- Postal code
- 204-0021
- Regional Internet Registry
- APNIC
- Allocated
- 1997-03-01
- Data source(s)
- maxmind_city, maxmind_asn, ipinfo_lite, maxmind_country
- Last updated
- 2026-06-10 12:21:42
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 133.31.0.238?
133.31.0.238 is allocated to Tokyo University of Science (AS55390), registered in Matsuyama, Japan.
Where is 133.31.0.238 located?
The geolocation for 133.31.0.238 maps to Matsuyama, 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 133.31.0.238 on?
133.31.0.238 belongs to the 133.31.0.0/20 network block announced by AS55390. This range contains 4,096 addresses.
Does 133.31.0.238 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.
