81.27.72.0/23 - C4L MAINFRAME & CYBERNETIC SYSTEMS LIMITED (AS25577)
CIDR
81.27.72.0/23
IP Version
IPv4
Addresses
512
Mask
/23 (255.255.254.0)
Country
🇬🇧 United Kingdom
City
London
RIR
RIPE NCC
Status
allocated
Allocated
2002-04-11
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
Swipe sideways to see all columns →
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 81.27.72.0/23 | AS25577 C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED | No ROA | RIPE | 2026-10-11 |
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS25577 | RIPE | c4l-mnt | 2025-03-13 |
More Specific Prefixes
| Prefix | AS | Country | Status |
|---|---|---|---|
| 81.27.72.32/29 | 🇬🇧GB | assigned | |
| 81.27.72.48/29 | 🇬🇧GB | assigned | |
| 81.27.72.80/29 | 🇬🇧GB | assigned | |
| 81.27.72.96/28 | 🇬🇧GB | assigned | |
| 81.27.72.128/29 | 🇬🇧GB | assigned | |
| 81.27.72.160/28 | 🇬🇧GB | assigned | |
| 81.27.72.192/29 | 🇬🇧GB | assigned | |
| 81.27.72.224/28 | 🇬🇧GB | assigned | |
| 81.27.73.0/28 | 🇬🇧GB | assigned | |
| 81.27.73.64/26 | 🇬🇧GB | assigned | |
| 81.27.73.128/26 | 🇬🇧GB | assigned | |
| 81.27.73.208/28 | 🇬🇧GB | assigned |
Transfer History
Registry transfers of 81.27.72.0/23, blocks inside it, or blocks containing it.
- 81.27.72.0/23Transfer ·
- 81.27.64.0/20Transfer ·
Related Prefixes
More prefixes of AS25577
All prefixes of AS25577 →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/81.27.72.0/23Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/81.27.72.0/23" | jq
External Links