AS37917 UTINS University of Tsukuba
Announced Prefixes (BGP)
3total
3 IPv40 IPv6
IPv4 Addresses
Allocated (RIR)66,560
Announced (BGP)132,096
IPv6 Addresses
Allocated (RIR)0
Announced (BGP)0
Prefix Limit (IPv4)
100
Prefix Limit (IPv6)
5
Allocated
-
Announced Prefixes
(BGP)3|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 |
Allocated Prefixes
(RIR)2Prefix | Country | RIR | Status |
|---|---|---|---|
| 130.158.0.0/16 | 🇯🇵 JP | APNIC | allocated |
| 163.220.252.0/22 | 🇯🇵 JP | APNIC | allocated |
ASPA
No ASPA
External Links
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
- ASPA explainedWhy AS37917 should publish an ASPA object
- IPv4 transfer marketTransfers published by all five RIRs
- ASN data in AI agents and SIEMMCP server and API integrations
API
Open https://api.ipctl.io/v1/asn/37917Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/37917" | jq