AS33651Comcast Cable Communications, LLC
United StatesRegistryARINAs of 10th November 2026, AS33651 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 109 IPv4 prefixes covering 85k addresses and 187 IPv6 prefixes. By IPv4 address space that makes it the 2,687th-largest of the 80,733 networks we see originating IPv4, and the 861st-largest of 18,751 in the United States. It is seen behind 2 upstream networks, most often AS7922 (Comcast Cable Communications, LLC) and AS3356 (Lumen (Level 3)), and in front of 144 downstream networks. 95% of its announcements have a valid RPKI ROA; 5 are RPKI-invalid. 81% of its routes reach at least 90% of full-feed peers, and 59 prefixes are also originated by another network.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS33651 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS33651 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
318
adjacent networks
- Upstreams
- 21%
- Peers
- 17254%
- Downstreams
- 14445%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS7922Comcast Cable Communications, LLC | US | Peer | 24,471 | 138 |
| AS3356Lumen (Level 3) | US | Peer | 528 | 29 |
Prefixes
All 296The largest blocks AS33651 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 140.89.64.0/18 | 16.4k | 47/76 |
| 9.142.96.0/19 | 8.2k | 3/76 |
| 135.132.64.0/19 | 8.2k | 4/76 |
| 9.142.48.0/20 | 4.1k | 3/76 |
| 138.226.64.0/20 | 4.1k | 3/76 |
| 23.230.200.0/21 | 2k | 50/76 |
| 64.84.96.0/21 | 2k | 76/76 |
| 64.84.120.0/21 | 2k | 76/76 |
| 138.226.48.0/21 | 2k | 4/76 |
| 138.226.112.0/21 | 2k | 3/76 |
Routing health
How AS33651'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
- Valid94.6%280
- Invalid1.7%5
- No ROA3.7%11
Propagation
- Globally propagated90% of full-feed peers or more81.4%241
- Partially propagated40% to 90%8.8%26
- Seen by few peersUnder 40%9.8%29
Prefix sizes
IPv4 — 109 prefixes
IPv6 — 187 prefixes
- /2934.4B × /640.5%1
- /441M × /640.5%1
- /4865.5k × /6498.9%185
Recent changes
Announcements that started or stopped since 12th Oct 2026.
- Announced103.111.63.0/2410th Nov 2026
- Announced135.132.72.0/2210th Nov 2026
- Announced135.132.76.0/2210th Nov 2026
- Announced138.226.196.0/2210th Nov 2026
- Announced9.142.118.0/2310th Nov 2026
- Withdrawn169.128.104.0/229th Nov 2026
- Withdrawn169.128.228.0/229th Nov 2026
- Withdrawn103.111.63.0/249th Nov 2026
- Withdrawn135.132.72.0/229th Nov 2026
- Withdrawn135.132.76.0/229th Nov 2026
- Withdrawn138.226.196.0/229th Nov 2026
- Withdrawn9.142.118.0/239th Nov 2026
29 announced and 31 withdrawn in all; the most recent are shown.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.