AS104 COLORADO-AS - University of Colorado at Boulder
🇺🇸ARINassigned
Announced Prefixes (BGP)
25total
21 IPv44 IPv6
IPv4 Addresses
Allocated (RIR)72,704
Announced (BGP)95,232
IPv6 Addresses
Allocated (RIR)7.9×10²⁸
Announced (BGP)7.9×10²⁸
Routing hygiene
Score 63/100 · High riskRPKI ROA coverage
12%
2 prefixes RPKI invalid
IRR route objects
88%
3 prefixes registered for another origin
Hijack signals
2
2 announced against others' ROAs, 0 own announced by others
Upstreams
3
diversity 56/100
- 88% of announced prefixes (22 of 25) have no valid ROA, 2 of them RPKI invalid
- Announces 2 prefixes that RPKI assigns to another network (possible hijack or misconfiguration)
Based on 25 announced prefixes, updated daily (2026-10-23). How the score works · RPKI explained
Announced Prefixes
(BGP)25|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| No ROA | Other IRR | 2026-10-26 | |
| Valid | ARINOther IRR | 2026-10-26 | |
| Valid | ARINOther IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 | |
| No ROA | Other IRR | 2026-10-26 |
1-10 of 25
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Allocated Prefixes
(RIR)15Prefix | Country | RIR | Status |
|---|---|---|---|
| 128.138.0.0/16 | 🇺🇸 US | ARIN | allocated |
| 192.12.238.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.12.240.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.12.241.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.12.242.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.12.244.0/24 | 🇺🇸 US | ARIN | allocated |
| 192.12.245.0/24 | 🇺🇸 US | ARIN | allocated |
| 198.11.16.0/20 | 🇺🇸 US | ARIN | allocated |
| 198.59.7.0/24 | 🇺🇸 US | ARIN | allocated |
| 198.59.51.0/24 | 🇺🇸 US | ARIN | allocated |
1-10 of 15
1 / 2
ASPA
No ASPA
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
- ASPA explainedWhy AS104 should publish an ASPA object
- IPv4 transfers in the ARIN 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/104Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/104" | jq