AS4721 JCN JCOM Co., Ltd.
Announced Prefixes (BGP)
163total
162 IPv41 IPv6
IPv4 Addresses
Allocated (RIR)562,176
Announced (BGP)1.3M
IPv6 Addresses
Allocated (RIR)7.9×10²⁸
Announced (BGP)7.9×10²⁸
Prefix Limit (IPv4)
1,000
Prefix Limit (IPv6)
5
Allocated
-
Announced Prefixes
(BGP)163|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 | |
| Valid | Other IRR | 2026-10-11 |
1-10 of 163
1 / 17
Allocated Prefixes
(RIR)48Prefix | Country | RIR | Status |
|---|---|---|---|
| 14.193.0.0/16 | 🇯🇵 JP | APNIC | allocated |
| 110.4.48.0/20 | 🇯🇵 JP | APNIC | allocated |
| 110.92.80.0/20 | 🇯🇵 JP | APNIC | allocated |
| 110.93.0.0/21 | 🇯🇵 JP | APNIC | allocated |
| 110.173.240.0/20 | 🇯🇵 JP | APNIC | allocated |
| 110.232.0.0/19 | 🇯🇵 JP | APNIC | allocated |
| 110.232.128.0/21 | 🇯🇵 JP | APNIC | allocated |
| 111.90.0.0/17 | 🇯🇵 JP | APNIC | allocated |
| 112.137.32.0/20 | 🇯🇵 JP | APNIC | allocated |
| 112.137.64.0/18 | 🇯🇵 JP | APNIC | allocated |
1-10 of 48
1 / 5
All 163 announced prefixes of AS4721 →
BGP Neighbours
(seen in AS paths)Upstreams (1)
Networks AS4721 hands its own prefixes to: transit providers, or peers at an exchange.
- AS9824JTCL JP JCOM163
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 AS4721 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/4721Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/4721" | jq