AS21508 Comcast Cable Communications, LLC 🇺🇸 US
Announcing 78 prefixes, seen at the RIS collectors.
IPv4 prefixes
17
70,400 (275 × /24)
IPv6 prefixes
61
61 × /48
Upstreams
1
transit providers observed
Peers
0
settlement-free adjacencies
Downstreams
49
transit customers observed
Customer cone
20,165
ASes reachable through it
Registry and operator data
- AS number
- AS21508
- Name
- Comcast Cable Communications, LLC
- Organisation
- Comcast - Richmond
- Country
- 🇺🇸 US
- RIR
- ARIN
- Allocated
- 2001-05-16
- Network type
- Cable/DSL/ISP
- Scope
- Regional
- Peering policy
- Restrictive
- PeeringDB
- net/10095
- Facilities
- 1
RPKI coverage of this AS
Its own announcements, validated against the current ROA set
Announced prefixes
17 in total
| Prefix | RPKI | Peers | Sample path | First seen |
|---|---|---|---|---|
| 50.204.101.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.205.217.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.216.229.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.217.1.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.217.207.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.218.47.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.228.113.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.229.113.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.229.114.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 50.235.34.0/24 v4 | RPKI valid | 43 | 7018792221508 | 2026-09-18 |
| 141.104.0.0/16 v4 | no ROA | 43 | 7018792221508 | 2026-09-18 |
| 157.240.147.0/24 v4 | no ROA | 43 | 7018792221508 | 2026-10-01 |
| 157.240.148.0/24 v4 | no ROA | 43 | 7018792221508 | 2026-09-18 |
| 173.242.174.0/24 v4 | no ROA | 43 | 7018792221508 | 2026-09-18 |
| 198.90.112.0/22 v4 | no ROA | 43 | 7018792221508 | 2026-09-18 |
| 204.194.47.0/24 v4 | no ROA | 43 | 7018792221508 | 2026-09-18 |
| 205.223.19.0/24 v4 | no ROA | 43 | 7018792221508 | 2026-09-18 |