AS49 — US-NATIONAL-INSTITUTE-OF-STANDARDS-AND-TECHNOLOGY - National Institute of Standards and Technology

AS49 announces 12 IPv4 prefixes covering 65,536 addresses and 5 IPv6 prefixes.

About this network

An early low-numbered allocation serving the US National Institute of Standards and Technology (NIST), the federal measurement-standards agency.

What it's used for

• Research and operational networking for a US government civilian agency.

Notable

• A US government agency's network, not a commercial ISP or host.
• The low AS number reflects an allocation from the internet's earliest years.

Interesting

• NIST operates the nation's official time and frequency services, which many systems rely on for accurate clocks.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 129.6.0.0/19
• 129.6.32.0/22
• 129.6.36.0/24
• 129.6.38.0/23
• 129.6.40.0/21
• 129.6.48.0/23
• 129.6.50.0/24
• 129.6.52.0/22
• 129.6.56.0/21
• 129.6.64.0/18
• 129.6.128.0/17
• 132.163.96.0/23
• 2610:20:6000::/37
• 2610:20:6f15::/48
• 2610:20:6f96::/47
• 2610:20:6fcd::/48
• 2610:20:6fce::/47

Upstream networks

• AS3477 National Oceanic and Atmospheric Administration
• AS13335 Cloudflare, Inc.
• AS3356 Level 3 Parent, LLC

Adjacent networks

• AS3477 National Oceanic and Atmospheric Administration
• AS13335 Cloudflare, Inc.
• AS3356 Level 3 Parent, LLC

Routing security

• RPKI: 36 valid, 0 invalid and 0 not-found announcements; 44 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 44 route objects.
• Listed in as-sets: AS-3477-ALL, AS-TELSTRA-INTL-CUSTOMERS, AS13335:AS-CUSTOMERS.