139.143.204.0/23

AS209237 · NPL Management LTD

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Summary

Country	United Kingdom
Domain	npl.co.uk
ASN	AS209237
Registry	RIPE
ID	NPL-LEGACY

WHOIS Details

inetnum:        139.143.0.0 - 139.143.255.255
netname:        NPL-LEGACY
org:            ORG-NPL11-RIPE
descr:          NPL Management Ltd
descr:          National Physical Laboratory
descr:          Hampton Road
descr:          Teddington
descr:          Middlesex
descr:          TW11 0LW
country:        GB
admin-c:        DG13162-RIPE
admin-c:        NPL13-RIPE
tech-c:         NPL13-RIPE
tech-c:         DG13162-RIPE
status:         LEGACY
mnt-by:         RIPE-NCC-LEGACY-MNT
mnt-by:         JANET-HOSTMASTER
mnt-routes:     EXPONENTIAL-E-MNT
mnt-routes:     JIPS-NOSC
created:        1970-01-01T00:00:00Z
last-modified:  2022-08-04T09:50:24Z
source:         RIPE
sponsoring-org: ORG-UA23-RIPE
abuse-email:    network.manager@npl.co.uk
abuse-c:        NPLA2-RIPE
abuse-org:      ORG-UA23-RIPE

organisation:   ORG-NPL11-RIPE
org-name:       NPL Management LTD
country:        GB
org-type:       OTHER
address:        National Physical Laboratory
address:        Hampton Road
address:        Teddington
address:        Middlesex
address:        TW11 0LW
address:        United Kingdom
phone:          +44 208 943 6000
e-mail:         network.manager@npl.co.uk
admin-c:        DG13162-RIPE
admin-c:        NPL13-RIPE
tech-c:         DG13162-RIPE
tech-c:         NPL13-RIPE
abuse-c:        NPLA2-RIPE
mnt-ref:        JANET-HOSTMASTER
mnt-by:         JANET-HOSTMASTER
mnt-by:         JIPS-NOSC
created:        2019-03-11T12:30:26Z
last-modified:  2022-12-01T17:21:06Z
source:         RIPE

role:           NPL Network Manager
address:        NPL Management LTD
address:        National Physical Laboratory
address:        Hampton Road
address:        Teddington
address:        Middlesex
address:        TW11 0LW
address:        United Kingdom
phone:          +44 208 943 6000
e-mail:         network.manager@npl.co.uk
nic-hdl:        NPL13-RIPE
mnt-by:         JANET-HOSTMASTER
mnt-by:         JIPS-NOSC
created:        2019-03-11T11:58:03Z
last-modified:  2019-03-11T12:05:25Z
source:         RIPE

person:         Daniel Galbraith
address:        National Physical Laboratory
address:        Hampton Road
address:        Teddington
address:        Middlesex
address:        TW11 0LW
address:        GB
phone:          +44 2089437016
e-mail:         daniel.galbraith@npl.co.uk
nic-hdl:        DG13162-RIPE
mnt-by:         JANET-HOSTMASTER
created:        2022-08-04T09:40:29Z
last-modified:  2022-08-04T09:40:29Z
source:         RIPE

route:          139.143.0.0/16
descr:          NPL Management Ltd
origin:         AS209237
mnt-by:         JIPS-NOSC
created:        2019-03-29T08:16:34Z
last-modified:  2019-03-29T08:16:34Z
source:         RIPE

route:          139.143.0.0/16
descr:          NPL Management Ltd
origin:         AS25180
mnt-by:         EXPONENTIAL-E-MNT
mnt-by:         JIPS-NOSC
created:        2019-03-29T08:16:34Z
last-modified:  2019-03-29T08:16:34Z
source:         RIPE

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

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
77.110.165.87	AS8462 Tarr Kft.	`7.45ms` from Budapest, HU
117.97.139.71	AS24560 Bharti Airtel Ltd., Telemedia Services	`10.21ms` from Chennai, IN
189.162.180.183	AS8151 UNINET	`4.36ms` from Guadalajara, MX
182.44.117.71	AS58519 Cloud Computing Corporation	`0.34ms` from Guiyang, CN
152.32.128.167	AS135377 UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED	`1.45ms` from Hong Kong, HK
194.106.196.23	AS213403 Kairos Ltd.	`1.21ms` from Moscow, RU
61.68.196.119	AS7545 TPG Telecom Limited	`1.19ms` from Perth, AU
213.194.218.119	AS207187 TKR Jasek, s.r.o.	`6.03ms` from Prague, CZ
108.198.161.247	AS7018 AT&T Enterprises, LLC	`3.65ms` from San Antonio, US
186.247.106.215	AS7738 V tal	`9.17ms` from Sao Paulo, BR
49.161.125.39	AS17858 LG POWERCOMM	`7.28ms` from Seoul, KR
119.196.207.167	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
121.159.92.7	AS4766 Korea Telecom	`2.98ms` from Seoul, KR
41.211.89.183	AS36868 Rogers Capital Technology Services Ltd	`0.28ms` from Singapore, SG
111.241.85.7	AS3462 Data Communication Business Group	`1.21ms` from Taipei, TW
52.192.190.135	AS16509 Amazon.com, Inc.	`0.16ms` from Tokyo, JP
115.162.196.71	AS2527 Sony Network Communications Inc.	`1.57ms` from Tokyo, JP
171.93.70.215	AS4134 CHINANET-BACKBONE	`8.23ms` from Chengdu, CN
141.98.183.87	AS203061 UAB code200	`0.35ms` from Dallas, US
217.69.74.119	AS61157 PlusServer GmbH	`0.41ms` from Duesseldorf, DE
76.82.174.7	AS20001 Charter Communications Inc	`8.48ms` from Los Angeles, US
113.131.24.151	AS45365 LG HelloVision Corp.	`11.07ms` from Seoul, KR
18.139.146.151	AS16509 Amazon.com, Inc.	`0.12ms` from Singapore, SG
36.110.71.7	AS4847 China Networks Inter-Exchange	`2.35ms` from Tianjin, CN
54.69.59.167	AS16509 Amazon.com, Inc.	`0.14ms` from Boardman, US

Traceroute

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

traceroute -a -n -q1 -m4 139.143.204.226

traceroute to 139.143.204.226 (139.143.204.226): 4 hops max, 52 byte packets

1 [AS202422] 146.185.219.3 0.18 ms

2 *

3 *

4 *

Measurement taken from

IPinfo ProbeNet in Tel Aviv, IL

On August 22nd 2025

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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