AS25921LUS Fiber
United StatesRegistryARINTypeEyeballAs of 23rd October 2026, AS25921 (LUS Fiber), an access network registered in the United States with ARIN, originates 38 IPv4 prefixes covering 105k addresses. By IPv4 address space that makes it the 2,327th-largest of the 79,652 networks we see originating IPv4, and the 746th-largest of 18,475 in the United States. It is seen behind 2 upstream networks, most often AS3356 (Lumen (Level 3)) and AS7018 (AT&T Enterprises, LLC), and in front of 2 downstream networks. None of its announcements have a valid RPKI ROA. 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 AS25921 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS25921 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
9
adjacent networks
- Upstreams
- 222%
- Peers
- 556%
- Downstreams
- 222%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS3356Lumen (Level 3) | US | Peer | 2,663 | 76 |
| AS7018AT&T Enterprises, LLC | US | Peer | 438 | 45 |
Prefixes
All 38The largest blocks AS25921 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 76.72.0.0/17 | 32.8k | 77/77 |
| 74.80.0.0/18 | 16.4k | 77/77 |
| 12.166.216.0/21 | 2k | 77/77 |
| 69.1.160.0/21 | 2k | 77/77 |
| 69.1.168.0/21 | 2k | 77/77 |
| 69.1.176.0/21 | 2k | 77/77 |
| 69.1.184.0/21 | 2k | 77/77 |
| 74.80.0.0/21 | 2k | 77/77 |
| 74.80.8.0/21 | 2k | 77/77 |
| 74.80.16.0/21 | 2k | 77/77 |
Routing health
How AS25921'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
- Valid0.0%0
- Invalid0.0%0
- No ROA100.0%38
Propagation
- Globally propagated90% of full-feed peers or more100.0%38
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
Recent changes
Announcements that started or stopped since 23rd Sept 2026.
No announcement by AS25921 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.