AS49National Institute of Standards and Technology
United StatesRegistryARINAs of 13th October 2026, AS49 (National Institute of Standards and…), a network registered in the United States with ARIN, originates 29 IPv4 prefixes covering 81.7k addresses and 7 IPv6 prefixes. By IPv4 address space that makes it the 2,739th-largest of the 79,585 networks we see originating IPv4, and the 881st-largest of 18,443 in the United States. It is seen behind 3 upstream networks, most often AS3477 (National Oceanic and Atmospheric…) and AS13335 (Cloudflare, Inc.). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 83% 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 AS49 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS49 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
- 350%
- Peers
- 350%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS3477National Oceanic and Atmospheric Administration | US | Peer | 1,270 | 144 |
| AS13335Cloudflare, Inc. | US | Peer | 600 | 146 |
| AS3356Lumen (Level 3) | US | Peer | 432 | 146 |
Prefixes
All 36The largest blocks AS49 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 129.6.128.0/17 | 32.8k | 80/81 |
| 129.6.64.0/18 | 16.4k | 80/81 |
| 129.6.64.0/19 | 8.2k | 1/81 |
| 129.6.96.0/20 | 4.1k | 1/81 |
| 129.6.0.0/21 | 2k | 80/81 |
| 129.6.16.0/21 | 2k | 80/81 |
| 129.6.40.0/21 | 2k | 80/81 |
| 129.6.56.0/21 | 2k | 80/81 |
| 129.6.120.0/21 | 2k | 1/81 |
| 129.6.8.0/22 | 1k | 80/81 |
Routing health
How AS49'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
- Valid100.0%36
- Invalid0.0%0
- No ROA0.0%0
Propagation
- Globally propagated90% of full-feed peers or more83.3%30
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%16.7%6
Prefix sizes
IPv4 — 29 prefixes
IPv6 — 7 prefixes
- /37134M × /6414.3%1
- /4865.5k × /6485.7%6
Recent changes
Announcements that started or stopped since 13th Sept 2026.
No announcement by AS49 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.