AS18731 Cityside Fiber
AS18731 is operated by Cityside Fiber and registered with ARIN (US) since 2023-10-12.
It announces 5 IPv4 and 3 IPv6 prefixes, 87% of them RPKI valid.
RIPE RIS sees 4 upstream and peer networks and 0 downstream networks next to it.
| Name | Cityside Fiber |
|---|---|
| Registry handle | CITYSIDE-01 |
| Registry (RIR) | ARIN |
| Country | United States (US) |
| Delegated on | 2023-10-12 |
| Prefixes (IPv4 / IPv6) | 5 / 3 |
| RPKI valid | 87% (7 / 8) |
| Upstreams and peers | 4 |
| Downstream networks | 0 |
Routing health
- AS18731 announces 5 IPv4 and 3 IPv6 prefixes.
- 7 of 8 announced prefixes are RPKI valid.
- 1 announced prefixes are not covered by a ROA of AS18731 (they may have none, or another network’s).
- 4 upstreams and peers, 0 downstream networks seen.
For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.
Announced prefixes 8
- 23.164.40.0/24
- 128.177.138.0/24
- 154.50.58.0/24
- 157.238.80.0/20
- 198.170.224.0/19
- 2607:73c0:8000::/33
- 2607:73c0::/32
- 2607:73c0::/33
Upstreams and peers 4
The networks RIPE RIS sees next to AS18731 in BGP paths, the most visible first.
Peering
AS18731 is not in PeeringDB. Networks that peer at internet exchanges are expected to keep a record there with their policy, exchange addresses and contacts.
More about AS18731
Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-14 11:44 UTC. The country is where the AS number was registered, not necessarily where the network operates.