AS3527

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Summary

IP address summary information
Name	National Institutes of Health
Country	United States
Website	host.io/nih.gov·nih.gov
Hosted domains	39
IPv4 addresses	336,640
IPv6 addresses	3.87 × 10²⁵
ASN type	Government
Registry	ARIN
Allocated	32 years ago on Apr 7, 1994
Updated	3 years ago on Oct 28, 2022

Ranking

#7,703

Overall rank

among 74,768 networks

Traffic

#4,391

Infrastructure

#12,081

#1,348inUnited States

Learn how ASN rankings work

Geolocation

Share of IPv4 footprint per hexagonLessMore

Countries by IPv4 share

United States
100%

Held location over 90 days: 72%
Held location over 1 year: 78%
Median days between moves: 32 days
Geolocation scope: City

How consistently this network's IPs hold their geolocation. Read relative to the network type, not as a quality score.

Activity

A pronounced day/night rhythm — the signature of a consumer/eyeball network whose users sleep at night.

Mon

IP Ranges

Netblock	Company	Num of IPs
128.231.0.0/16	National Institutes of Health	65,536
137.187.0.0/16	National Institutes of Health	65,536
156.40.0.0/16	National Institutes of Health	65,536
157.98.0.0/16	National Institutes of Health	65,536
165.112.0.0/16	National Institutes of Health	65,536
162.99.224.0/19	National Institutes of Health	8,192
192.231.146.0/23	National Institutes of Health	512
128.231.3.0/24	National Institutes of Health	256
128.231.245.0/24	National Institutes of Health	256
192.231.145.0/24	National Institutes of Health	256

IP Ranges

WHOIS


  ASHandle:       █████
  OrgID:          █████
  ASName:         ██████
  ASNumber:       AS█████
  RegDate:        ████-██-██
  Updated:        ████-██-██
  TechHandle:     ████-████
  Source:         ████

Hosted Domains

There are 39 domain names hosted across 26 IP addresses on this ASN.

IP Address	Domain	Count
156.40.18.44		7
137.187.52.151		5
128.231.19.108		2
156.40.212.210		2
128.231.19.104		2

Places

Peers

There are 3 peers for this ASN.

ASN	Name	Rank
AS6150	National Cancer Institute
AS10886	University of Maryland
AS19050	U.S. Department of Health & Human Services

Upstreams

There are 2 upstreams for this ASN.

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

Downstreams

There are 1 downstreams for this ASN.

ASN	Name	Rank
AS6150	National Cancer Institute

Pingable IPs

11 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more

IP Address	ASN	Details
192.231.145.110 Ping	AS3527National Institutes of Health	1.71ms from Ashburn, US
128.231.3.15 Ping	AS3527National Institutes of Health	4.33ms from Ashburn, US
137.187.10.214 Ping	AS3527National Institutes of Health	4.03ms from Ashburn, US
137.187.61.10 Ping	AS3527National Institutes of Health	2.95ms from Ashburn, US
2607:f220:403:f1::4:2 Ping	AS3527National Institutes of Health	2.37ms from Ashburn, US
165.112.170.253 Ping	AS3527National Institutes of Health	4.26ms from Ashburn, US
128.231.244.194 Ping	AS3527National Institutes of Health	1.72ms from Ashburn, US
156.40.178.9 Ping	AS3527National Institutes of Health	2.58ms from Ashburn, US
128.231.128.228 Ping	AS3527National Institutes of Health	6.99ms from Ashburn, US
128.231.58.117 Ping	AS3527National Institutes of Health	2.62ms from Ashburn, US

Other Pingable IPs

IP Address	ASN	Details

Pingable IPs

Important routers in AS3527


2607:f220:41d::10:2000:6	Frederick, United States
2607:f220:41d:5aff::a	Frederick, United States
128.231.17.1	Bethesda, United States
157.98.0.254	Durham, United States
2607:f220:41d:10::14a	Frederick, United States
137.187.240.98	Bethesda, United States
165.112.152.8	Bethesda, United States
2607:f220:41d:10::149	Frederick, United States
2607:f220:403:f5::14:1	Bethesda, United States
2607:f220:403:f5::14:2	Bethesda, United States

Important routers in AS3527

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this ASN. Learn more.Traceroute →

$ traceroute -a -n -q1 -m5 128.231.94.189

traceroute to 128.231.94.189 (128.231.94.189): 5 hops max, 52 byte packets

1 [AS31898] 140.91.242.14 0.077 ms

2 [AS15802] 91.74.125.170 0.309 ms

3 *

4 *

5 *

Measurement taken from

IPinfo ProbeNet in Abu Dhabi, AE

On October 9, 2026

What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS3527 at robtex.

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AS3527

Summary

Ranking

Geolocation

Countries by IPv4 share

Activity

IP Ranges

IP Ranges

WHOIS

Hosted Domains

Places

Peers

Upstreams

Downstreams

Pingable IPs

Other Pingable IPs

Pingable IPs

Important routers in AS3527

Important routers in AS3527

Traceroute

Related Networks

AS1382

AS13867

AS19458

AS26102

AS26590

What is an ASN?

An API built with users in mind: reliable, accurate, and easy-to-use

Our IP tools

What is my IP?

Map IPs

Summarize IPs

Traceroute

Ranking

IP Ranges

Important routers in AS3527

Geolocation

Countries by IPv4 share

Pingable IPs

Other Pingable IPs

Activity

AS1382

AS13867

AS19458

AS26102

AS26590

AS30263