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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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	`6.79ms` 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
66.61.61.232	AS10796 Charter Communications Inc	`13.57ms` from Ashburn, US
18.116.147.104	AS16509 Amazon.com, Inc.	`0.11ms` from Columbus, US
141.39.220.120	AS211286 MEASUREMENT NETWORK	`0.41ms` from Duesseldorf, DE
84.180.223.88	AS3320 Deutsche Telekom AG	`5.29ms` from Frankfurt am Main, DE
194.213.120.8	AS51315 PE teleradiokompaniya Lebedin	`4.03ms` from Kharkiv, UA
145.82.115.88	AS25019 Saudi Telecom Company JSC	`4.34ms` from Manama, BH
80.80.37.168	AS42560 Telemach BH d.o.o. Sarajevo	`6.03ms` from Novi Travnik, BA
124.142.151.248	AS9824 JCOM Co., Ltd.	`13.20ms` from Tokyo, JP
47.27.4.152	AS20115 Charter Communications LLC	`10.19ms` from Atlanta, US
110.189.77.24	AS4134 CHINANET-BACKBONE	`8.04ms` from Chengdu, CN
23.220.218.104	AS16625 Akamai Technologies, Inc.	`0.93ms` from Chicago, US
20.236.113.56	AS8075 Microsoft Corporation	`0.36ms` from Chicago, US
216.62.30.232	AS7018 AT&T Enterprises, LLC	`2.50ms` from Dallas, US
79.235.151.120	AS3320 Deutsche Telekom AG	`1.75ms` from Frankfurt am Main, DE
135.225.0.40	AS8075 Microsoft Corporation	`0.19ms` from Gaevle, SE
103.39.80.168	AS58895 Ebone Network (PVT.) Limited	`1.11ms` from Karachi, PK
115.96.111.88	AS17488 Hathway IP Over Cable Internet	`1.74ms` from Kolkata, IN
86.168.192.24	AS2856 British Telecommunications PLC	`1.86ms` from London, GB
87.75.182.216	AS25310 Vodafone Limited	`6.87ms` from Manchester, GB
86.227.127.40	AS3215 Orange S.A.	`14.00ms` from Marseille, FR
131.202.219.168	AS611 NB-PEI Educational Computer Network	`15.55ms` from Montreal, CA
73.190.160.232	AS7922 Comcast Cable Communications, LLC	`14.10ms` from Murfreesboro, US
91.7.17.40	AS3320 Deutsche Telekom AG	`5.26ms` from Nuernberg, DE
147.192.180.56	AS2527 Sony Network Communications Inc.	`2.17ms` from Osaka, JP
8.220.211.136	AS45102 Alibaba (US) Technology Co., Ltd.	`0.15ms` from Seoul, KR

Traceroute

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

traceroute -a -n -q1 216.21.19.2

traceroute to 216.21.19.2 (216.21.19.2): 64 hops max, 52 byte packets

1 [AS15169] 108.170.226.215 218.801 ms

2 [AS22773] 70.167.150.213 242.553 ms

3 [AS22773] 68.1.2.217 240.039 ms

4 *

5 [AS5721] 216.21.19.2 244.701 ms

Measurement taken from

IPinfo ProbeNet in Jakarta, ID

On December 20th 2025

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