Autonomous System details

AS17421

Mobile Business Group  ·  twnic.net.tw

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AS17421 – Mobile Business Group

Field Value
Country Taiwan
Website twnic.net.tw
Hosted domains 30
IPv4 addresses 1,655,040
IPv6 addresses 40,570,331,909,040,783,556,931,162,734,592
ASN type Business
Registry apnic
Updated 4 months ago on Nov 06, 2025
Netblock Company Num of IPs
42.74.0.0/16 Mobile Business Group 65,536
42.75.0.0/16 Mobile Business Group 65,536
111.80.0.0/16 Chunghwa Telecom Co.,Ltd. 65,536
42.73.0.0/17 Mobile Business Group 32,768
42.73.128.0/17 Mobile Business Group 32,768
42.79.0.0/17 Mobile Business Group 32,768
111.82.0.0/17 Chunghwa Telecom Co.,Ltd. 32,768
111.82.128.0/17 Chunghwa Telecom Co.,Ltd. 32,768
223.143.0.0/17 Chunghwa Telecom Co.,Ltd. 32,768
42.70.0.0/18 Mobile Business Group 16,384
42.70.64.0/18 Mobile Business Group 16,384
42.70.128.0/18 Mobile Business Group 16,384
42.70.192.0/18 Mobile Business Group 16,384
42.71.0.0/18 Mobile Business Group 16,384
42.71.64.0/18 Mobile Business Group 16,384
42.71.128.0/18 Mobile Business Group 16,384
42.71.192.0/18 Mobile Business Group 16,384
42.72.0.0/18 Mobile Business Group 16,384
42.72.64.0/18 Mobile Business Group 16,384
42.72.128.0/18 Mobile Business Group 16,384
42.72.192.0/18 Mobile Business Group 16,384
42.76.0.0/18 Mobile Business Group 16,384
42.76.64.0/18 Mobile Business Group 16,384
42.76.128.0/18 Mobile Business Group 16,384
42.76.192.0/18 Mobile Business Group 16,384
42.77.0.0/18 Mobile Business Group 16,384
42.77.64.0/18 Mobile Business Group 16,384
42.77.128.0/18 Mobile Business Group 16,384
42.77.192.0/18 Mobile Business Group 16,384
42.78.0.0/18 Mobile Business Group 16,384
42.78.64.0/18 Mobile Business Group 16,384
42.78.128.0/18 Mobile Business Group 16,384
42.78.192.0/18 Mobile Business Group 16,384
42.79.0.0/18 Mobile Business Group 16,384
42.79.64.0/18 Mobile Business Group 16,384
111.70.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.71.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.71.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.71.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.81.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.81.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.81.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.81.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.83.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.83.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.83.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
111.83.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
114.136.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
114.136.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
114.136.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
114.136.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
114.137.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
114.137.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
116.59.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
116.59.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
116.59.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.136.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.136.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.137.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.137.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.137.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.137.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.138.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.138.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.139.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.139.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.139.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.139.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.140.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.140.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.140.128.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.140.192.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.141.0.0/18 Chunghwa Telecom Co.,Ltd. 16,384
223.141.64.0/18 Chunghwa Telecom Co.,Ltd. 16,384
42.79.128.0/19 Mobile Business Group 8,192
42.79.160.0/19 Mobile Business Group 8,192
42.79.192.0/19 Mobile Business Group 8,192
42.79.224.0/19 Mobile Business Group 8,192
114.137.0.0/19 Chunghwa Telecom Co.,Ltd. 8,192
114.137.32.0/19 Chunghwa Telecom Co.,Ltd. 8,192
114.137.64.0/19 Chunghwa Telecom Co.,Ltd. 8,192
114.137.96.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.136.0.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.136.32.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.136.64.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.136.96.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.138.0.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.138.32.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.138.64.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.138.96.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.141.128.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.141.160.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.141.192.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.141.224.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.143.128.0/19 Chunghwa Telecom Co.,Ltd. 8,192
223.143.160.0/19 Chunghwa Telecom Co.,Ltd. 8,192
116.59.48.0/20 Chunghwa Telecom Co.,Ltd. 4,096
116.59.16.0/21 Chunghwa Telecom Co.,Ltd. 2,048
116.59.24.0/21 Chunghwa Telecom Co.,Ltd. 2,048
221.120.0.0/21 Chunghwa Telecom Co.,Ltd. 2,048
223.143.192.0/21 Chunghwa Telecom Co.,Ltd. 2,048
223.143.200.0/21 Chunghwa Telecom Co.,Ltd. 2,048
223.143.208.0/21 Chunghwa Telecom Co.,Ltd. 2,048
223.143.216.0/21 Chunghwa Telecom Co.,Ltd. 2,048
223.143.224.0/21 Chunghwa Telecom Co.,Ltd. 2,048
223.143.232.0/21 Chunghwa Telecom Co.,Ltd. 2,048
116.59.12.0/22 Chunghwa Telecom Co.,Ltd. 1,024
221.120.8.0/22 Chunghwa Telecom Co.,Ltd. 1,024
221.120.12.0/22 Chunghwa Telecom Co.,Ltd. 1,024
221.120.40.0/22 Chunghwa Telecom Co.,Ltd. 1,024
221.120.76.0/22 Chunghwa Telecom Co.,Ltd. 1,024
111.71.242.0/23 Chunghwa Telecom Co.,Ltd. 512
116.59.10.0/23 Chunghwa Telecom Co.,Ltd. 512
221.120.32.0/23 Chunghwa Telecom Co.,Ltd. 512
221.120.36.0/23 Chunghwa Telecom Co.,Ltd. 512
221.120.42.0/23 Chunghwa Telecom Co.,Ltd. 512
221.120.46.0/23 Chunghwa Telecom Co.,Ltd. 512
221.120.48.0/23 Chunghwa Telecom Co.,Ltd. 512
221.120.58.0/23 Chunghwa Telecom Co.,Ltd. 512
223.143.240.0/23 Chunghwa Telecom Co.,Ltd. 512
223.143.242.0/23 Chunghwa Telecom Co.,Ltd. 512
223.143.244.0/23 Chunghwa Telecom Co.,Ltd. 512
223.143.246.0/23 Chunghwa Telecom Co.,Ltd. 512
111.71.193.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.194.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.195.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.196.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.197.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.208.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.209.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.212.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.213.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.214.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.215.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.216.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.217.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.218.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.220.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.221.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.222.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.223.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.225.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.226.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.227.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.228.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.229.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.230.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.240.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.248.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.252.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.253.0/24 Chunghwa Telecom Co.,Ltd. 256
111.71.254.0/24 Chunghwa Telecom Co.,Ltd. 256
116.59.0.0/24 Chunghwa Telecom Co.,Ltd. 256
116.59.2.0/24 Chunghwa Telecom Co.,Ltd. 256
116.59.8.0/24 Chunghwa Telecom Co.,Ltd. 256
116.59.9.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.33.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.34.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.35.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.36.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.37.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.38.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.40.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.41.0/24 Chunghwa Telecom Co.,Ltd. 256
211.79.42.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.19.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.20.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.21.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.23.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.30.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.34.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.38.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.40.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.41.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.44.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.45.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.50.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.51.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.56.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.57.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.72.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.73.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.74.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.75.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.80.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.81.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.82.0/24 Chunghwa Telecom Co.,Ltd. 256
221.120.83.0/24 Chunghwa Telecom Co.,Ltd. 256

Netblock Company
2001:b400::/23 HiNet Taiwan
2001:b400:e000::/36 HiNet Taiwan
2001:b400:e100::/44 HiNet Taiwan
2001:b400:e110::/44 HiNet Taiwan
2001:b400:e120::/44 HiNet Taiwan
2001:b400:e130::/44 HiNet Taiwan
2001:b400:e140::/44 HiNet Taiwan
2001:b400:e150::/44 HiNet Taiwan
2001:b400:e160::/44 HiNet Taiwan
2001:b400:e170::/44 HiNet Taiwan
2001:b400:e3e0::/44 HiNet Taiwan
2001:b400:e3f0::/44 HiNet Taiwan
2001:b400:e500::/44 HiNet Taiwan
2001:b400:e510::/44 HiNet Taiwan
2001:b400:e520::/44 HiNet Taiwan
2001:b400:e530::/44 HiNet Taiwan
2001:b400:e540::/44 HiNet Taiwan
2001:b400:e550::/44 HiNet Taiwan
2001:b400:e560::/44 HiNet Taiwan
2001:b400:e570::/44 HiNet Taiwan
2001:b400:e600::/44 HiNet Taiwan
2001:b400:e610::/44 HiNet Taiwan
2001:b400:e620::/44 HiNet Taiwan
2001:b400:e630::/44 HiNet Taiwan
2001:b400:e640::/44 HiNet Taiwan
2001:b400:e650::/44 HiNet Taiwan
2001:b400:e660::/44 HiNet Taiwan
2001:b400:e670::/44 HiNet Taiwan
2001:b400:d208::/45 HiNet Taiwan
2001:b400:d408::/45 HiNet Taiwan
2001:b400:f208::/45 HiNet Taiwan
2001:b400:f218::/45 HiNet Taiwan
2001:b400:f408::/45 HiNet Taiwan
2001:b400:f418::/45 HiNet Taiwan

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IP Ranges API

WHOIS Details


                                                ASHandle:       AS17421
                                                OrgID:          AS17421
                                                ASName:         AS17421
                                                ASNumber:       AS17421
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

                                            
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Hosted Domains

There are 30 domain names hosted across 27 IP addresses on this ASN.

IP Address Domain Domains on this IP
42.74.109.17 ██████████ 2
221.120.57.28 ██████████ 2
221.120.43.157 ██████████ 2
111.70.11.180 ██████████ 1
111.80.133.85 █████████ 1
221.120.2.250 ██████████ 1
221.120.2.202 ██████████ 1
111.70.8.238 ██████████ 1
223.140.76.154 ██████████ 1
111.70.10.85 ██████████ 1

Discover all domains hosted on a single IP address with IPinfo's powerful Hosted Domains (Reverse IP) solution.
Useful for Cybersecurity

Peers

There is 1 peer for this ASN.

Peers Name
AS3462 Data Communication Business Group
Get this data and more insights on related domains, allocation dates, registry names, IP counts with IPinfo's IP-to-ASN product.

Upstreams

There is 1 peer for this ASN.

upstreams Name
AS3462 Data Communication Business Group
Get this data and more insights on related domains, allocation dates, registry names, IP counts with IPinfo's IP-to-ASN product.

Downstreams

There are no downstreams for this ASN.

Get this data and more insights on related domains, allocation dates, registry names, IP counts with IPinfo's IP-to-ASN product.

Pingable IPs

1,795 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
2001:b400:e284:8da9:7885:8bc9:d73a:d10b AS17421 Mobile Business Group 17.08ms from Chang-hua, TW
2001:b400:e67e:812a:6149:cabc:c81d:ba64 AS17421 Mobile Business Group 31.67ms from Chang-hua, TW
2001:b400:e630:845a:99eb:2c03:3594:f85f AS17421 Mobile Business Group 18.05ms from Chang-hua, TW
2001:b400:e62e:bc8f:906a:30ce:5859:68ae AS17421 Mobile Business Group 14.43ms from Chang-hua, TW
2001:b400:e152:cd0c:676b:d9c5:cc0c:b94c AS17421 Mobile Business Group 11.58ms from Chang-hua, TW
2001:b400:e657:78a:1e85:10f5:afe5:3900 AS17421 Mobile Business Group 26.77ms from Chang-hua, TW
2001:b400:e256:c09e:cd0f:c570:88be:44b3 AS17421 Mobile Business Group 15.74ms from Chang-hua, TW
2001:b400:e2f0:5c0c:18ba:9361:6257:b678 AS17421 Mobile Business Group 10.95ms from Chang-hua, TW
2001:b400:e51d:c10b:1638:e3f3:5880:6644 AS17421 Mobile Business Group 18.11ms from Chang-hua, TW
2001:b400:e204:6e5e:d937:73eb:776b:28d AS17421 Mobile Business Group 19.93ms from Chang-hua, TW
2001:b400:e108:1cf4:60ec:b4df:a59:c87d AS17421 Mobile Business Group 17.89ms from Chang-hua, TW
2001:b400:e10f:864e:782d:f6ff:fe77:409d AS17421 Mobile Business Group 11.61ms from Chang-hua, TW
2001:b400:e564:e38a:6136:36ee:dae8:7440 AS17421 Mobile Business Group 25.59ms from Chang-hua, TW
2001:b400:e3fb:b98e:216d:5899:6784:13d9 AS17421 Mobile Business Group 10.62ms from Chang-hua, TW
2001:b400:e304:9255:2d13:90cf:ebe:315b AS17421 Mobile Business Group 19.17ms from Chang-hua, TW
2001:b400:e671:1cf6:bd2e:13ce:e0e2:ab4a AS17421 Mobile Business Group 15.95ms from Chang-hua, TW
2001:b400:e250:7b41:b411:e1ff:fe13:b02a AS17421 Mobile Business Group 17.71ms from Chang-hua, TW
2001:b400:e60f:2820:bc3d:daff:fe81:dd5a AS17421 Mobile Business Group 28.42ms from Chang-hua, TW
2001:b400:e126:dab8:4b29:4035:e14f:5d5d AS17421 Mobile Business Group 20.11ms from Chang-hua, TW
2001:b400:e3d2:4f31:4988:65ab:62f5:6fc5 AS17421 Mobile Business Group 20.10ms from Chang-hua, TW
2001:b400:e52d:4979:9c26:d586:2cf1:7bca AS17421 Mobile Business Group 16.82ms from Chang-hua, TW
2001:b400:e543:821d:6866:c1b9:60b7:723b AS17421 Mobile Business Group 14.86ms from Chang-hua, TW
2001:b400:e113:b3e4:b84c:4a80:5bd5:4e9b AS17421 Mobile Business Group 17.39ms from Chang-hua, TW
2001:b400:e2ae:c6c3:78fa:4abc:6660:49d2 AS17421 Mobile Business Group 19.30ms from Chang-hua, TW
2001:b400:e787:f45b:f0ac:b256:12f0:3259 AS17421 Mobile Business Group 18.72ms from Chang-hua, TW

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
138.137.51.125 AS5972 United States Department of Defense (DoD) 4.41ms from Ashburn, US
73.251.43.109 AS7922 Comcast Cable Communications, LLC 9.78ms from Ashburn, US
87.202.83.109 AS6799 Ote SA (Hellenic Telecommunications Organisation) 8.92ms from Athens, GR
71.81.26.13 AS20115 Charter Communications LLC 5.17ms from Atlanta, US
35.224.18.189 AS396982 Google LLC 0.12ms from Council Bluffs, US
51.199.30.61 AS5607 Sky UK Limited 0.97ms from Dublin, IE
189.135.141.141 AS8151 UNINET 11.62ms from Guadalajara, MX
58.253.71.109 AS17816 China Unicom IP network China169 Guangdong province 8.17ms from Guangzhou, CN
91.16.125.189 AS3320 Deutsche Telekom AG 3.75ms from Hamburg, DE
27.72.93.189 AS7552 Viettel Group 1.77ms from Hanoi, VN
123.202.6.45 AS9269 Hong Kong Broadband Network Ltd. 1.23ms from Hong Kong, HK
203.252.224.157 AS17615 Chongju University 2.99ms from Incheon, KR
102.36.203.125 AS328526 CloudFace Pty Ltd 0.34ms from Johannesburg, ZA
209.114.110.13 AS18460 Fort Hays State University 13.70ms from Kansas City, US
136.26.8.61 AS19165 Webpass Inc. 3.44ms from Los Angeles, US
69.130.194.173 AS4181 TDS TELECOM 10.82ms from Los Angeles, US
187.150.186.13 AS8151 UNINET 12.38ms from Miami, US
45.33.78.45 AS63949 Akamai Connected Cloud 0.13ms from Morris Plains, US
195.225.96.125 AS212667 RECONN LLC 0.64ms from Moscow, RU
3.168.100.125 AS16509 Amazon.com, Inc. 0.15ms from New York City, US
216.10.13.77 AS54103 MOD Mission Critical, LLC 0.11ms from New York City, US
118.16.28.189 AS4713 NTT DOCOMO BUSINESS,Inc. 10.68ms from Osaka, JP
62.97.207.45 AS8542 Eviny Fiber AS 1.05ms from Oslo, NO
87.247.164.253 AS137989 BigHub Co.,Ltd 0.96ms from Phnom Penh, KH
108.62.18.253 AS19148 Leaseweb USA, Inc. 1.19ms from Phoenix, US

Traceroute

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

$
traceroute -a -n -q1 -m5 111.82.192.5
traceroute to 111.82.192.5 (111.82.192.5): 5 hops max, 52 byte packets
3 *
4 *
5 *
Measurement taken from IPinfo ProbeNet in Abu Dhabi, AE
On

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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 AS17421 at robtex.

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