AS205311 Cambridge_Fibre_Networks Cambridge Fibre Networks Ltd.
🇬🇧Org handle: ORG-CFNL1-RIPE
RIPE NCCallocatedASPA Published
Announced Prefixes (BGP)
3total
2 IPv41 IPv6
IPv4 Addresses
Allocated (RIR)1,280
Announced (BGP)1,280
IPv6 Addresses
Allocated (RIR)6.3×10²⁹
Announced (BGP)6.3×10²⁹
Routing hygiene
Score 10/100 · Low riskRPKI ROA coverage
100%
no RPKI invalid prefixes
IRR route objects
100%
no origin mismatches
Hijack signals
0
0 announced against others' ROAs, 0 own announced by others
Upstreams
1
diversity 0/100
- Only one upstream seen in the AS paths of its routes
Based on 3 announced prefixes, updated daily (2026-10-19). How the score works · RPKI explained
Announced Prefixes
(BGP)3|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| Valid | RIPE | 2026-10-25 | |
| Valid | RIPE | 2026-10-25 | |
| Valid | RIPE | 2026-10-25 |
Allocated Prefixes
(RIR)3Prefix | Country | RIR | Status |
|---|---|---|---|
| 185.219.108.0/22 | 🇬🇧 GB | RIPENCC | allocated |
| 185.229.51.0/24 | 🇬🇧 GB | RIPE | assigned |
| 2a0b:e540::/29 | 🇬🇧 GB | RIPENCC | allocated |
All 3 announced prefixes of AS205311 →
Upstream Providers(1)
| ASN | Name |
|---|---|
| AS35826 | 🇬🇧NETSERVERS-AS Netservers Limited |
BGP Neighbours
(seen in AS paths)Upstreams (1)
Networks AS205311 hands its own prefixes to: transit providers, or peers at an exchange.
- AS35826NETSERVERS Limited3
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
- How to run an ASPA checkVerify the upstream providers listed above
- 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/205311Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/205311" | jq