AS3527 — NIH-NET
AS3527 announces 51 IPv4 prefixes covering 324,608 addresses and 4 IPv6 prefixes.
About this network
NIH-NET, the network of the US National Institutes of Health, the federal government's principal medical research agency, headquartered in Bethesda, Maryland.
What it's used for
- Campus and research networking across the NIH intramural programme — labs, the Clinical Center, and the institutes and centres that make up NIH.
- Public-facing NIH services such as PubMed and the National Library of Medicine sit behind NIH's networks.
Notable
- Government and research address space (roughly 325,000 IPv4 addresses) — a large institutional allocation rather than a commercial one.
- Traffic here is overwhelmingly institutional: researchers, hospital systems, and public biomedical data services, not residential subscribers.
Interesting
- Registered with ARIN in 1994, from the era when large federal science agencies connected to the internet directly rather than through a commercial carrier.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 128.231.0.0/16
- 137.187.0.0/16
- 156.40.0.0/19
- 156.40.32.0/20
- 156.40.48.0/22
- 156.40.52.0/24
- 156.40.54.0/23
- 156.40.56.0/21
- 156.40.64.0/20
- 156.40.80.0/21
- 156.40.88.0/22
- 156.40.92.0/24
- 156.40.96.0/23
- 156.40.100.0/22
- 156.40.104.0/21
- 156.40.112.0/20
- 156.40.128.0/18
- 156.40.192.0/22
- 156.40.196.0/24
- 156.40.198.0/23
- 156.40.200.0/21
- 156.40.208.0/20
- 156.40.224.0/20
- 156.40.240.0/22
- 156.40.244.0/23
- 156.40.247.0/24
- 156.40.248.0/21
- 157.98.0.0/16
- 162.99.224.0/19
- 165.112.16.0/20
- 165.112.36.0/22
- 165.112.40.0/21
- 165.112.48.0/20
- 165.112.64.0/19
- 165.112.96.0/20
- 165.112.112.0/21
- 165.112.120.0/22
- 165.112.126.0/24
- 165.112.128.0/21
- 165.112.144.0/20
- 165.112.160.0/19
- 165.112.192.0/23
- 165.112.196.0/22
- 165.112.204.0/22
- 165.112.208.0/20
- 165.112.224.0/20
- 165.112.240.0/21
- 165.112.248.0/22
- 165.112.254.0/23
- 192.231.145.0/24
- 192.231.146.0/23
- 2607:f220:400::/43
- 2607:f220:412::/47
- 2607:f220:414::/46
- 2607:f220:418::/45
Upstream networks
Downstream networks
- AS6150 National Cancer Institute
Adjacent networks
BGP / ASN / CIDR
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IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED