AS33666Comcast Cable Communications, LLC
United StatesRegistryARINAs of 27th September 2026, AS33666 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 3 IPv4 prefixes covering 768 addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 44,914th-largest of the 79,525 networks we see originating IPv4, and the 9,395th-largest of 18,428 in the United States. It is seen behind 1 upstream network, most often AS7922 (Comcast Cable Communications, LLC), and in front of 5 downstream networks. 50% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS33666 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS33666 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.
Neighbouring networks
12
adjacent networks
- Upstreams
- 18%
- Peers
- 650%
- Downstreams
- 542%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS7922Comcast Cable Communications, LLC | US | Peer | 909 | 145 |
Prefixes
The largest blocks AS33666 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 66.170.177.0/24 | 256 | 79/81 |
| 66.170.179.0/24 | 256 | 81/81 |
| 199.120.255.0/24 | 256 | 79/81 |
| 2001:559:195::/48 | 65.5k × /64 | 64/64 |
| 2001:559:233::/48 | 65.5k × /64 | 64/64 |
| 2001:559:c507::/48 | 65.5k × /64 | 64/64 |
Routing health
How AS33666's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.
RPKI origin validation
- Valid50.0%3
- Invalid0.0%0
- No ROA50.0%3
Propagation
- Globally propagated90% of full-feed peers or more100.0%6
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 3 prefixes
IPv6 — 3 prefixes
- /4865.5k × /64100.0%3
Recent changes
Announcements that started or stopped since 28th Aug 2026.
No announcement by AS33666 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.