AS3527

Name: AS3527 — National Institutes of Health
Creator: ipdex

National Institutes of Health Unknown registered in United States

15IPv4 prefixes

1IPv6 prefixes

81%RPKI-valid

#13,672AS Rank

327/327RIS visibility

#2,159Rank in United States

1994-04-07Allocated

National Institutes of Health (AS3527) — Unknown, registered in United States. announces 15 IPv4 prefixes + 1 IPv6 prefixes. Rank in United States: #2159. Allocated: 1994-04-07.

IPv4 15IPv6 1

Announced prefixes · 16

v4 128.231.0.0/16 valid
v4 128.231.245.0/24 valid
v4 128.231.3.0/24 valid
v4 137.187.0.0/16 valid
v4 156.40.0.0/16 unknown
v4 157.98.0.0/16 unknown
v4 162.99.224.0/19 unknown
v4 165.112.0.0/16 valid
v4 165.112.0.0/20 valid
v4 165.112.0.0/21 valid
v4 165.112.136.0/21 valid
v4 192.231.145.0/24 valid
v4 192.231.146.0/23 valid
v4 192.231.146.0/24 valid
v4 192.231.147.0/24 valid
v6 2607:f220:400::/43 valid

RPKI: rpki.cloudflare.com · 2026-06-17

Routing: 15 IPv4 · 1 IPv6 announced · RIS visibility 327/327 RIS peers · RIPEstat · 2026-06-17

Prefix history

Announced prefixes Source: ipdex daily snapshot · sparse rows, value holds until the next change (steps)

Data table

Day	Announced prefixes
2026-06-12	16
2026-06-13	16

AS topology · Customer cone 1

Providers · 2

AS10886 University of Maryland
AS19050 U.S. Department of Health & Human Services

Peers · 1

AS6150 National Cancer Institute

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