AS2501 UTNET The University of Tokyo
Announced Prefixes (BGP)
7total
5 IPv42 IPv6
IPv4 Addresses
Allocated (RIR)135,168
Announced (BGP)202,752
IPv6 Addresses
Allocated (RIR)7.9×10²⁸
Announced (BGP)7.9×10²⁸
Prefix Limit (IPv4)
200
Prefix Limit (IPv6)
10
Allocated
-
Announced Prefixes
(BGP)7|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| No ROA | Other IRR | 2026-10-10 | |
| No ROA | Other IRR | 2026-10-10 | |
| No ROA | Other IRR | 2026-10-10 | |
| No ROA | - | 2026-10-10 | |
| No ROA | Other IRR | 2026-10-10 | |
| No ROA | Other IRR | 2026-10-10 | |
| No ROA | Other IRR | 2026-10-10 |
Allocated Prefixes
(RIR)4Prefix | Country | RIR | Status |
|---|---|---|---|
| 130.69.0.0/16 | 🇯🇵 JP | APNIC | allocated |
| 157.82.0.0/16 | 🇯🇵 JP | APNIC | allocated |
| 192.51.208.0/20 | 🇯🇵 JP | APNIC | allocated |
| 2404:d540::/32 | 🇯🇵 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 AS2501 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/2501Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/2501" | jq