AS104
University of Colorado at Boulder Unknown registered in United States
20IPv4 prefixes
1IPv6 prefixes
5%RPKI-valid
#12,750AS Rank
327/327RIS visibility
#1,664Rank in United States
1987-04-09Allocated
University of Colorado at Boulder (AS104) — Unknown, registered in United States. announces 20 IPv4 prefixes + 1 IPv6 prefixes. Rank in United States: #1664. Allocated: 1987-04-09.
IPv4 20IPv6 1
Announced prefixes · 21
- v4 128.138.0.0/16 unknown
- v4 129.19.192.0/18 valid
- v4 146.5.20.0/22 unknown
- v4 192.12.238.0/24 unknown
- v4 192.12.240.0/24 unknown
- v4 192.12.241.0/24 unknown
- v4 192.12.242.0/24 unknown
- v4 192.12.244.0/24 unknown
- v4 192.12.245.0/24 unknown
- v4 198.11.16.0/20 unknown
- v4 198.59.51.0/24 unknown
- v4 198.59.52.0/24 unknown
- v4 198.59.54.0/24 unknown
- v4 198.59.55.0/24 unknown
- v4 198.59.7.0/24 unknown
- v4 198.59.70.0/24 unknown
- v4 198.59.81.0/24 unknown
- v4 198.59.82.0/24 unknown
- v4 198.59.83.0/24 unknown
- v4 204.228.80.0/24 unknown
- v6 2620:18f::/32 unknown
RPKI: rpki.cloudflare.com · 2026-06-17
Routing: 20 IPv4 · 1 IPv6 announced · RIS visibility 327/327 RIS peers · RIPEstat · 2026-06-17
Prefix history
Data table
| Day | Announced prefixes |
|---|---|
| 2026-06-12 | 21 |
| 2026-06-13 | 21 |
AS topology · Customer cone 1
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