209.101.8.0/23 - BT UK British Telecommunications Limited (AS2856)
CIDR
209.101.8.0/23
IP Version
IPv4
Addresses
512
Mask
/23 (255.255.254.0)
Country
🇬🇧 United Kingdom
City
London
RIR
ARIN
Status
announced
Allocated
-
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
Swipe sideways to see all columns →
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 209.101.8.0/23 | AS2856 BT-UK-AS British Telecommunications Limited | Valid | ARINOther IRR | 2026-10-12 |
Covering Prefix
1 less-specific announcement| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 209.101.0.0/16 | AS3257 GTT-BACKBONE GTT Communications Inc. | No ROA | - | 2026-10-12 |
RPKI ROAs
| Prefix | Origin | Max Length | Trust Anchor |
|---|---|---|---|
| 209.101.8.0/23 | AS2856 | /23 | arin |
Transfer History
Registry transfers of 209.101.8.0/23, blocks inside it, or blocks containing it.
- 209.101.0.0/16M&A ·
- 209.101.0.0/16M&A ·
| Date | Resource | From | To | Type |
|---|---|---|---|---|
| 209.101.0.0/16 | M&A | |||
| 209.101.0.0/16 | M&A |
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 ARIN regionWho bought and sold address space recently
API
Open https://api.ipctl.io/v1/prefix/209.101.8.0/23Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/209.101.8.0/23" | jq
External Links