216.21.19.0/24

AS5721 · National Defense University

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Summary

Country	United States
Domain	ndu.edu
ASN	AS5721
Registry	ARIN
ID	NATIONAL-DEFENSE-UNIVERSITY

WHOIS Details

NetHandle:      NET-216-21-18-0-1
OrgID:          NDU-1
Parent:         NET-216-0-0-0-0
NetName:        NATIONAL-DEFENSE-UNIVERSITY
NetRange:       216.21.18.0 - 216.21.19.255
NetType:        allocation
Comment:        http://ndu.edu
RegDate:        2015-07-08
Updated:        2021-12-14
Source:         ARIN


OrgID:          NDU-1
OrgName:        National Defense University
CanAllocate:    
Street:         Ft. McNair, Bldg. 62
City:           Washington
State/Prov:     DC
Country:        US
PostalCode:     20319-6000
RegDate:        1994-10-04
Updated:        2015-05-07
OrgAdminHandle: CJH19-ARIN
OrgTechHandle:  CJH19-ARIN
OrgAbuseHandle: CJH19-ARIN
Source:         ARIN


POCHandle:      CJH19-ARIN
IsRole:         N
LastName:       hartley
FirstName:      christopher
Street:         National Defense University 
Street:         260 5th Ave, Bldg 64 Abraham Lincoln Hall
City:           Washington
State/Prov:     DC
Country:        US
PostalCode:     20319-5066
RegDate:        2015-04-24
Updated:        2015-04-24
OfficePhone:    +1-202-685-4716
Mailbox:        [email protected]
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 216.21.0.0/16

Range	ASN	Company	Num of IPs
216.21.32.0/19	AS16399	First Communications LLC	8,192
216.21.64.0/19	AS16423	NETTOGO	8,192
216.21.128.0/19	AS21723	Radiant Communications Ltd.	8,192
216.21.96.0/19	AS15116	Pittsburg State University	8,192
216.21.160.0/20	AS16591	Google Fiber Inc.	4,096
216.21.192.0/20	AS33247	COASTAL TELCO SERVICES, INC.	4,096
216.21.184.0/21	AS53256	MULBERRY TELEPHONE CO	2,048
216.21.24.0/21	AS40266	SpeedyQuick Networks Inc	2,048
216.21.216.0/21	AS54225	ORANGE COUNTY FIBER LLC	2,048
216.21.8.0/22	AS393964	High Mountain Farm, LLC	1,024
216.21.208.0/22	AS26223	Silver Star Communications	1,024
216.21.212.0/22	AS395846	Direct Communications Rockland, Inc	1,024
216.21.14.0/24	AS7377	RGnet, LLC	256
216.21.240.0/24	AS13649	Internet Pipeline, Inc.	256
216.21.233.0/24	AS36445	Coextro	256
216.21.17.0/24	AS400441	WINAC	256
216.21.5.0/24	AS40279	ForestRacks	256
216.21.230.0/24	AS40444	Constant Contact, Inc	256
216.21.1.0/24	AS63476	SMS Assist, L.L.C.	256
216.21.15.0/24	AS11233	Gorge Networks LLC	256

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

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Pingable IPs

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

IP Address	ASN	Details
216.21.19.13	AS5721 National Defense University	`6.95ms` from Ashburn, US

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
143.177.109.136	AS50266 Odido Netherlands B.V.	`3.57ms` from Amsterdam, NL
35.155.35.200	AS16509 Amazon.com, Inc.	`0.13ms` from Boardman, US
108.166.123.8	AS19994 Rackspace Hosting	`1.19ms` from Chicago, US
52.59.31.8	AS16509 Amazon.com, Inc.	`0.15ms` from Frankfurt am Main, DE
8.130.87.120	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`0.84ms` from Jining, CN
182.191.35.152	AS17557 Pakistan Telecommunication Company Limited	`3.85ms` from Karachi, PK
38.127.48.232	AS18978 Enzu Inc	`0.66ms` from Los Angeles, US
174.58.51.72	AS7922 Comcast Cable Communications, LLC	`8.15ms` from Miami, US
112.84.25.184	AS4837 CHINA UNICOM China169 Backbone	`7.75ms` from Nanjing, CN
71.105.180.104	AS701 Verizon Business	`2.65ms` from New York City, US
114.161.101.24	AS4713 NTT DOCOMO BUSINESS,Inc.	`3.04ms` from Osaka, JP
109.220.138.8	AS3215 Orange S.A.	`14.24ms` from Paris, FR
72.167.217.184	AS26496 GoDaddy.com, LLC	`1.16ms` from Phoenix, US
189.150.138.248	AS8151 UNINET	`15.86ms` from Santiago de Queretaro, MX
74.118.10.8	AS13341 Tranquility Internet Services Inc.	`5.03ms` from St. Louis, US
2.67.17.104	AS44034 Hi3G Access AB	`9.78ms` from Stockholm, SE
103.55.47.40	AS134139 Opticomm Co Pty Ltd	`2.07ms` from Sydney, AU
18.208.71.248	AS14618 Amazon.com, Inc.	`0.59ms` from Ashburn, US
75.88.239.248	AS7029 Windstream Communications LLC	`16.34ms` from Chicago, US
98.18.206.248	AS7029 Windstream Communications LLC	`14.57ms` from Chicago, US
68.50.87.40	AS7922 Comcast Cable Communications, LLC	`10.95ms` from Chicago, US
178.151.153.248	AS13188 CONTENT DELIVERY NETWORK LTD	`6.79ms` from Kyiv, UA
93.174.216.152	AS47563 Sports Information Services Limited	`4.94ms` from London, GB
34.148.215.88	AS396982 Google LLC	`0.14ms` from Moncks Corner, US
176.132.191.136	AS5410 Bouygues Telecom SA	`8.72ms` from Paris, FR

Traceroute

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

traceroute -a -n -q1 -f5 216.21.19.1

traceroute to 216.21.19.1 (216.21.19.1): 64 hops max, 52 byte packets

5 [AS1299] 213.248.76.25 1.331 ms

6 [AS22773] 68.1.2.217 6.253 ms

7 *

8 [AS22773] 216.54.84.238 7.803 ms

9 [AS5721] 216.21.19.1 7.996 ms

Measurement taken from

IPinfo ProbeNet in Ashburn, US

On January 9th 2026

What are IP address ranges?

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