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AS49National Institute of Standards and Technology

United StatesRegistryARIN

As of 22nd 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 2,731st-largest of the 79,655 networks we see originating IPv4, and the 877th-largest of 18,475 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

29

IPv6 prefixes

7

IPv4 addresses

81.7k

IPv6 /64s

135M

Upstream graph

The networks AS49 is seen behind, one and two hops out, drawn from real AS paths.

AS49Toward the internet core
Upstream graph for AS49: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS49National Institut…This networkAS3356Lumen (Level 3)AS3477National Oceanic …AS13335Cloudflare, Inc.AS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS11956National Oceanic …AS26100National Oceanic …AS6453TATA Communicatio…

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.

Upstreams of AS49
NetworkCountryRelationshipPathsVantage pts
AS3477National Oceanic and Atmospheric AdministrationUSPeer1,209139
AS13335Cloudflare, Inc.USPeer577141
AS3356Lumen (Level 3)USPeer418140

Prefixes

All 36

The largest blocks AS49 originates, widest first.

Largest prefixes originated by AS49
PrefixAddressesVisibility
129.6.128.0/1732.8k76/77
129.6.64.0/1816.4k76/77
129.6.64.0/198.2k1/77
129.6.96.0/204.1k1/77
129.6.0.0/212k76/77
129.6.16.0/212k76/77
129.6.40.0/212k76/77
129.6.56.0/212k76/77
129.6.120.0/212k1/77
129.6.8.0/221k76/77

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 22nd 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.