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	Prefix	Description
	128.231.0.0/16	National Institutes of Health
	128.231.3.0/24	National Institutes of Health
	128.231.245.0/24	National Institutes of Health
	137.187.0.0/16	National Institutes of Health
	156.40.0.0/16	Various Registries (Maintained by ARIN)
	157.98.0.0/16	National Institute of Environmental Health Sciences
	162.99.224.0/19	HRSA
	165.112.0.0/16	National Institutes of Health
	192.231.145.0/24	National Institutes of Health
	192.231.146.0/23	National Institutes of Health
	192.231.146.0/24	National Institutes of Health
	192.231.147.0/24	National Institutes of Health
	2607:f220:400::/43	National Institutes of Health

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS19050	U.S. Department of Health & Human Services	✔	✔

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Peers

	ASN	Description	IPv4	IPv6
	AS19050	U.S. Department of Health & Human Services	✔	✔
	AS10886	University of Maryland	✔	✔
	AS6150	National Cancer Institute	✔	✘

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Downstreams

	ASN	Description	IPv4	IPv6
	AS6150	National Cancer Institute	✔	✘

ASHandle:       AS3527
OrgID:          NIH-Z
ASName:         NIH-NET
ASNumber:       3527
RegDate:        1994-04-07
Updated:        2022-10-28
Source:         ARIN



OrgID:          NIH-Z
OrgName:        National Institutes of Health
CanAllocate:    
Street:         9000 Rockville Pike
Street:         MSC 4805
City:           Bethesda
State/Prov:     MD
Country:        US
PostalCode:     20892-4805
RegDate:        2022-10-09
Updated:        2025-06-05
OrgAdminHandle: NIHAD-ARIN
OrgTechHandle:  NIHTE-ARIN
OrgAbuseHandle: NIHTE-ARIN
OrgNOCHandle:   NIHAD-ARIN
OrgRoutingHandle:   NIHTE-ARIN
OrgDNSHandle:   NIHAD-ARIN
Source:         ARIN





OrgAdminHandle:       NIHAD-ARIN
OrgAdminName:          NIHadm
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        NIHTE-ARIN
OrgTechName:           NIHtechs
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       NIHTE-ARIN
OrgAbuseName:          NIHtechs
# Email removed, Log into bgp.tools to see whois emails


OrgNOCHandle:         NIHAD-ARIN
OrgNOCName:            NIHadm
# Email removed, Log into bgp.tools to see whois emails


OrgRoutingHandle:     NIHTE-ARIN
OrgRoutingName:        NIHtechs
# Email removed, Log into bgp.tools to see whois emails


OrgDNSHandle:         NIHAD-ARIN
OrgDNSName:            NIHadm
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2026-06-14T03:26:31Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
ARIN	as-nih	3
LEVEL3	as-level3-origins-na	0
LEVEL3	as-level3-customers-na	0
RADB	as10886:as-3527-all	3
RIPE	as-jaguar-peering-v6-nl-ix	27
RADB	as10886:as-all	68