AS13205 British Telecommunications Limited
🇬🇧Org handle: ORG-BT4-RIPE
BTWWIDC-H Autonomous System
RIPE NCCallocated
Announced Prefixes (BGP)
16total
16 IPv40 IPv6
IPv4 Addresses
Allocated (RIR)43,264
Announced (BGP)20,992
IPv6 Addresses
Allocated (RIR)9.4×10³¹
Announced (BGP)0
Prefix Limit (IPv4)
50
Prefix Limit (IPv6)
5
Country
🇬🇧 GBRIR
RIPE NCCStatus
allocated
Allocated
2000-05-04
Announced Prefixes
(BGP)16|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | RIPE | 2026-10-11 | |
| No ROA | - | 2026-10-11 |
1-10 of 16
1 / 2
Allocated Prefixes
(RIR)65Prefix | Country | RIR | Status |
|---|---|---|---|
| 31.11.56.0/21 | 🇬🇧 GB | RIPENCC | allocated |
| 31.11.56.0/23 | 🇳🇱 NL | RIPE | assigned |
| 78.109.0.0/20 | 🇬🇧 GB | RIPENCC | allocated |
| 78.109.5.0/24 | 🇳🇱 NL | RIPE | assigned |
| 78.109.6.0/24 | 🇳🇱 NL | RIPE | assigned |
| 78.109.7.0/24 | 🇳🇱 NL | RIPE | assigned |
| 78.109.9.0/24 | 🇳🇱 NL | RIPE | assigned |
| 78.109.10.0/24 | 🇳🇱 NL | RIPE | assigned |
| 78.109.11.0/24 | 🇳🇱 NL | RIPE | assigned |
| 192.31.31.0/24 | 🇬🇧 GB | RIPENCC | assigned |
1-10 of 65
1 / 7
ASPA
No ASPA
Abuse Contact
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 AS13205 should publish an ASPA object
- IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
- ASN data in AI agents and SIEMMCP server and API integrations
API
Open https://api.ipctl.io/v1/asn/13205Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/13205" | jq