AS61429Castor Marine B.V.
NetherlandsRegistryRIPE NCCAs of 27th September 2026, AS61429 (Castor Marine B.V.), a network registered in the Netherlands with RIPE NCC, originates 19 IPv4 prefixes covering 5.1k addresses. By IPv4 address space that makes it the 15,299th-largest of the 79,523 networks we see originating IPv4, and the 228th-largest of 1,023 in the Netherlands. It is seen behind 2 upstream networks, most often AS3257 (GTT Communications Inc.) and AS174 (Cogent Communications, LLC). 95% 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 AS61429 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS61429 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
6
adjacent networks
- Upstreams
- 233%
- Peers
- 467%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS3257GTT Communications Inc. |  US | Peer | 1,352 | 80 |
| AS174Cogent Communications, LLC | US | Peer | 185 | 80 |
Prefixes
The largest blocks AS61429 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 81.23.240.0/23 | 512 | 81/81 |
| 38.125.107.0/24 | 256 | 80/81 |
| 62.41.2.0/24 | 256 | 81/81 |
| 62.41.10.0/24 | 256 | 81/81 |
| 62.41.20.0/24 | 256 | 81/81 |
| 62.41.21.0/24 | 256 | 81/81 |
| 62.41.59.0/24 | 256 | 81/81 |
| 62.41.60.0/24 | 256 | 81/81 |
| 92.71.10.0/24 | 256 | 81/81 |
| 92.71.11.0/24 | 256 | 81/81 |
Routing health
How AS61429'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
- Valid94.7%18
- Invalid0.0%0
- No ROA5.3%1
Propagation
- Globally propagated90% of full-feed peers or more100.0%19
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 19 prefixes
Recent changes
Announcements that started or stopped since 28th Aug 2026.
No announcement by AS61429 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.