87.237.16.0/21 - BT UK British Telecommunications Limited (AS2856)
CIDR
87.237.16.0/21
IP Version
IPv4
Addresses
2K
Mask
/21 (255.255.248.0)
Country
🇬🇧 United Kingdom
City
London
RIR
RIPE NCC
Status
allocated
Allocated
2005-10-10
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
Swipe sideways to see all columns →
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 87.237.16.0/21 | AS2856 BT-UK-AS British Telecommunications Limited | Valid | RIPE | 2026-10-11 |
RPKI ROAs
| Prefix | Origin | Max Length | Trust Anchor |
|---|---|---|---|
| 87.237.16.0/21 | AS2856 | /21 | ripe |
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS2856 | RIPE | BTNET-INFRA-MNT | 2025-07-14 |
More Specific Prefixes
| Prefix | AS | Country | Status |
|---|---|---|---|
| 87.237.16.0/22 | 🇬🇧GB | assigned | |
| 87.237.20.0/23 | 🇬🇧GB | assigned | |
| 87.237.22.0/26 | 🇬🇧GB | assigned | |
| 87.237.22.64/26 | 🇬🇧GB | assigned | |
| 87.237.22.128/25 | 🇬🇧GB | assigned | |
| 87.237.23.0/24 | 🇬🇧GB | assigned |
Related Prefixes
Geolocation
Abuse Contact
Learn more
- RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
- RPKI validatorCheck ROA coverage for any prefix or ASN
- What is BGP?How prefixes are announced and routed
- More-specific prefixesGlossary: covering and more-specific routes
- IPv4 transfers in the RIPE NCC regionWho bought and sold address space recently
API
Open https://api.ipctl.io/v1/prefix/87.237.16.0/21Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/87.237.16.0/21" | jq
External Links