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:        chris.hartley.ctr@ndu.edu
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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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	`6.77ms` 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
140.233.233.24	AS6079 RCN	`0.95ms` from Ashburn, US
109.129.230.232	AS5432 Proximus NV	`1.93ms` from Brussels, BE
223.229.245.168	AS24560 Bharti Airtel Ltd., Telemedia Services	`9.21ms` from Delhi, IN
194.113.173.40	AS3209 Vodafone GmbH	`2.76ms` from Frankfurt am Main, DE
93.67.30.120	AS30722 Fastweb SpA	`4.50ms` from Frosinone, IT
223.184.125.8	AS24560 Bharti Airtel Ltd., Telemedia Services	`2.15ms` from Hyderabad, IN
37.139.247.72	AS8359 MTS PJSC	`12.68ms` from Krasnoyarsk, RU
196.240.104.200	AS41564 Orion Network Limited	`0.87ms` from London, GB
212.231.199.248	AS15704 XTRA TELECOM S.A.	`1.48ms` from Madrid, ES
79.25.239.152	AS3269 Telecom Italia S.p.A.	`4.18ms` from Milan, IT
217.243.112.8	AS3320 Deutsche Telekom AG	`0.78ms` from Nuernberg, DE
181.91.116.232	AS7303 Telecom Argentina S.A.	`2.27ms` from Rosario, AR
34.176.156.184	AS396982 Google LLC	`0.08ms` from Santiago, CL
189.180.232.104	AS8151 UNINET	`1.26ms` from Santiago de Queretaro, MX
74.118.10.8	AS13341 Tranquility Internet Services Inc.	`3.51ms` from St. Louis, US
195.47.205.8	AS39648 DataCom Group Nordic AB	`6.66ms` from Stockholm, SE
120.107.162.56	AS1659 Taiwan Academic Network (TANet) Information Center	`1.31ms` from Taichung, TW
27.232.80.136	AS4766 Korea Telecom	`1.95ms` from Incheon, KR
114.207.43.216	AS9318 SK Broadband Co Ltd	`1.53ms` from Incheon, KR
86.189.167.168	AS2856 British Telecommunications PLC	`6.20ms` from London, GB
95.78.204.248	AS56420 JSC "ER-Telecom Holding"	`3.94ms` from Moscow, RU
182.166.107.120	AS17511 OPTAGE Inc.	`2.07ms` from Osaka, JP
86.218.9.72	AS3215 Orange S.A.	`6.30ms` from Paris, FR
151.53.143.168	AS1267 WIND TRE S.P.A.	`6.38ms` from Rome, IT
92.64.84.120	AS1136 KPN B.V.	`0.50ms` from Amsterdam, NL

Traceroute

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

traceroute -a -n -q1 216.21.19.12

traceroute to 216.21.19.12 (216.21.19.12): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.213 182.273 ms

2 *

3 [AS22773] 68.1.2.217 194.092 ms

4 *

5 [AS22773] 216.54.84.238 195.219 ms

6 [AS5721] 216.21.19.12 201.929 ms

Measurement taken from

IPinfo ProbeNet in Chang-hua, TW

On January 30th 2026

What are IP address ranges?

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