Autonomous System details

AS21301

Natwest Markets PLC  ·  natwestmarkets.com

United Kingdom

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AS21301 – Natwest Markets PLC

Field Value
Country United Kingdom
Website natwestmarkets.com
Hosted domains 5
IPv4 addresses 2,304
IPv6 addresses 0
ASN type Business
Registry ripe
Allocated 24 years ago on Oct 24, 2001
Updated 10 days ago on Apr 10, 2026

IP Ranges

Netblock Company Num of IPs
155.136.56.0/22 NatWest 1,024
155.136.200.0/23 NatWest 512
155.136.202.0/23 NatWest 512
155.136.56.0/24 NatWest 256
155.136.57.0/24 NatWest 256
155.136.58.0/24 NatWest 256
155.136.59.0/24 NatWest 256
155.136.144.0/24 NatWest 256
155.136.146.0/24 NatWest 256
155.136.151.0/24 NatWest 256
155.136.200.0/24 NatWest 256
155.136.201.0/24 NatWest 256

There are no known IPv6 addresses belonging to this network

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WHOIS Details

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                                                ASHandle:       AS21301
                                                OrgID:          AS21301
                                                ASName:         AS21301
                                                ASNumber:       AS21301
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA
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Hosted Domains

There are 5 domain names hosted across 7 IP addresses on this ASN.

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IP Address Domain Domains on this IP
155.136.200.12 ██████████ 2
155.136.200.1 ██████████ 1
155.136.200.59 ██████████ 1

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Peers

There are 3 peers for this ASN.

Peers Name
AS1273 Vodafone Group PLC
AS2856 British Telecommunications PLC
AS32787 Akamai Technologies, Inc.
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Upstreams

There are 3 upstreams for this ASN.

upstreams Name
AS1273 Vodafone Group PLC
AS2856 British Telecommunications PLC
AS32787 Akamai Technologies, Inc.
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Downstreams

There are no downstreams for this ASN.

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Pingable IPs

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

IP Address ASN Details
155.136.200.27 AS21301 Natwest Markets PLC 12.28ms from London, GB
155.136.58.8 AS21301 Natwest Markets PLC 12.30ms from London, GB
155.136.56.43 AS21301 Natwest Markets PLC 12.24ms from London, GB
155.136.201.249 AS21301 Natwest Markets PLC 12.38ms from London, GB
155.136.151.71 AS21301 Natwest Markets PLC 12.35ms from London, GB

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
41.242.100.133 AS37608 iRENALA 1.74ms from Antananarivo, MG
158.193.245.5 AS2607 Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET 3.72ms from Bratislava, SK
174.110.143.149 AS11426 Charter Communications Inc 8.41ms from Charlotte, US
87.118.79.37 AS31103 Keyweb AG 0.26ms from Erfurt, DE
162.209.137.213 AS40065 CNSERVERS LLC 0.23ms from Los Angeles, US
94.86.222.69 AS3269 Telecom Italia S.p.A. 4.96ms from Milan, IT
220.156.0.165 AS2497 Internet Initiative Japan Inc. 7.19ms from Osaka, JP
133.206.160.197 AS2518 BIGLOBE Inc. 3.15ms from Osaka, JP
92.158.10.181 AS3215 Orange S.A. 5.34ms from Paris, FR
112.240.17.117 AS4837 CHINA UNICOM China169 Backbone 5.10ms from Qingdao, CN
2.229.113.197 AS12874 Fastweb SpA 1.73ms from Rome, IT
68.85.39.69 AS7922 Comcast Cable Communications, LLC 1.52ms from Salt Lake City, US
52.250.242.117 AS8075 Microsoft Corporation 0.61ms from San Jose, US
222.222.1.101 AS4134 CHINANET-BACKBONE 1.27ms from Shijiazhuang, CN
138.91.45.197 AS8075 Microsoft Corporation 0.69ms from Singapore, SG
79.125.192.85 AS6821 Makedonski Telekom AD-Skopje 1.62ms from Skopje, MK
158.95.59.149 AS55256 Netskope Inc 0.17ms from Sydney, AU
1.175.20.165 AS3462 Data Communication Business Group 5.67ms from Taichung, TW
119.239.154.69 AS2518 BIGLOBE Inc. 2.08ms from Tokyo, JP
2.17.49.213 AS16625 Akamai Technologies, Inc. 0.15ms from Bangkok, TH
82.143.70.21 AS6848 Telenet BV 2.67ms from Brussels, BE
179.38.75.69 AS22927 Telefonica de Argentina 1.54ms from Buenos Aires, AR
98.29.248.101 AS10796 Charter Communications Inc 16.07ms from Columbus, US
181.211.184.5 AS28006 CORPORACION NACIONAL DE TELECOMUNICACIONES - CNT EP 1.54ms from Guayaquil, EC
173.0.167.181 AS5555 Sohonet Limited 0.25ms from Los Angeles, US

Traceroute

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

$
traceroute -a -n -q1 -f3 -m8 155.136.151.69
traceroute to 155.136.151.69 (155.136.151.69): 8 hops max, 52 byte packets
3 [] 5.57.81.220 10.378 ms
4 [AS32787] 104.86.67.83 10.421 ms
6 *
7 *
8 *
Measurement taken from IPinfo ProbeNet in Edinburgh, GB
On

Related Networks

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 AS21301 at robtex.

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