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 29
IPv4 addresses 1,654,016
IPv6 addresses 40,570,331,909,040,783,556,931,162,734,592
ASN type Business
Registry apnic
Updated 3 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
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 29 domain names hosted across 26 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
221.120.2.202 ██████████ 1
111.70.5.86 ██████████ 1
223.140.76.154 ██████████ 1
111.70.31.184 ██████████ 1
221.120.4.184 ██████ 1
111.70.20.229 ██████████ 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

1,829 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
2001:b400:e2aa:bac9:b810:2e50:9786:ffce AS17421 Mobile Business Group 18.89ms from Chang-hua, TW
2001:b400:e644:5c60:fefa:d7e3:4c4b:5ac1 AS17421 Mobile Business Group 18.53ms from Chang-hua, TW
2001:b400:e253:8b44:41f9:af10:6a4:3c9c AS17421 Mobile Business Group 17.00ms from Chang-hua, TW
2001:b400:e12d:adbf:9c8f:514a:f73b:ee0a AS17421 Mobile Business Group 12.62ms from Chang-hua, TW
2001:b400:e336:62f9:8876:cb3b:7b8d:7b03 AS17421 Mobile Business Group 19.36ms from Chang-hua, TW
2001:b400:e25b:3c0f:c499:f4ff:fe14:8f0 AS17421 Mobile Business Group 17.14ms from Chang-hua, TW
2001:b400:e655:bfb4:50a9:1f59:3cb:a89b AS17421 Mobile Business Group 26.21ms from Chang-hua, TW
2001:b400:e171:6519:e567:9dde:beef:1250 AS17421 Mobile Business Group 11.53ms from Chang-hua, TW
2001:b400:e24e:603b:f95d:94ce:a07a:e233 AS17421 Mobile Business Group 11.46ms from Chang-hua, TW
2001:b400:e120:e577:e394:987a:23ac:26c4 AS17421 Mobile Business Group 12.71ms from Chang-hua, TW
2001:b400:e27b:8ab9:4170:8877:42ee:603f AS17421 Mobile Business Group 19.40ms from Chang-hua, TW
2001:b400:e28c:b069:901e:82c3:8dae:ef10 AS17421 Mobile Business Group 17.63ms from Chang-hua, TW
2001:b400:e539:41cc:ed14:a363:fbdd:2e84 AS17421 Mobile Business Group 60.59ms from Chang-hua, TW
2001:b400:e203:a301:b4ff:9ff:feaa:6ff1 AS17421 Mobile Business Group 19.76ms from Chang-hua, TW
2001:b400:e30f:5377:9f08:73d2:2c2e:71f AS17421 Mobile Business Group 24.75ms from Chang-hua, TW
2001:b400:e495:eb6f:482f:51e9:aef0:6cd4 AS17421 Mobile Business Group 14.34ms from Chang-hua, TW
2001:b400:e752:1ad1:8c51:5731:2d1:a9d5 AS17421 Mobile Business Group 22.57ms from Chang-hua, TW
2001:b400:e278:7598:cc2c:8b8a:3c98:ecdd AS17421 Mobile Business Group 18.33ms from Chang-hua, TW
2001:b400:e550:e82a:e54f:11ca:8446:11fa AS17421 Mobile Business Group 22.41ms from Chang-hua, TW
2001:b400:e233:d493:6a4f:bd1d:4a28:b30e AS17421 Mobile Business Group 16.66ms from Chang-hua, TW
2001:b400:e630:171:2ecf:53b4:e66:4600 AS17421 Mobile Business Group 31.68ms from Chang-hua, TW
2001:b400:e67f:d2c:a59c:edce:9753:9b16 AS17421 Mobile Business Group 17.09ms from Chang-hua, TW
2001:b400:e430:5546:6dc9:4041:e417:2e9a AS17421 Mobile Business Group 19.14ms from Chang-hua, TW
2001:b400:e142:1f0e:fc0b:93bd:1d1b:61b3 AS17421 Mobile Business Group 16.73ms from Chang-hua, TW
2001:b400:e408:8315:f00f:76ff:fe12:3069 AS17421 Mobile Business Group 25.08ms 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
145.97.211.93 AS1103 SURF B.V. 1.07ms from Amsterdam, NL
82.173.109.77 AS13127 Odido Netherlands B.V. 17.18ms from Amsterdam, NL
50.210.15.221 AS7922 Comcast Cable Communications, LLC 10.00ms from Ashburn, US
138.26.29.253 AS3452 University of Alabama at Birmingham 3.40ms from Atlanta, US
116.131.137.77 AS4837 CHINA UNICOM China169 Backbone 9.47ms from Beijing, CN
82.119.105.45 AS6830 Liberty Global Europe Holding B.V. 3.96ms from Bratislava, SK
83.64.133.141 AS8412 T-Mobile Austria GmbH 4.11ms from Graz, AT
91.16.125.189 AS3320 Deutsche Telekom AG 3.62ms from Hamburg, DE
171.241.231.173 AS7552 Viettel Group 2.98ms from Hanoi, VN
102.213.243.13 AS329199 STL FIBERCO LTD 10.36ms from Lagos, NG
90.204.150.237 AS5607 Sky UK Limited 3.61ms from London, GB
158.101.31.221 AS31898 Oracle Corporation 0.92ms from Phoenix, US
206.87.192.141 AS393249 University of British Columbia 7.67ms from Seattle, US
173.182.83.253 AS852 TELUS Communications Inc. 19.89ms from Toronto, CA
37.115.53.221 AS15895 "Kyivstar" PJSC 6.86ms from Warsaw, PL
219.157.70.45 AS4837 CHINA UNICOM China169 Backbone 2.26ms from Zhengzhou, CN
87.202.5.77 AS6799 Ote SA (Hellenic Telecommunications Organisation) 12.51ms from Athens, GR
120.12.254.45 AS4837 CHINA UNICOM China169 Backbone 5.80ms from Beijing, CN
86.126.114.125 AS8708 DIGI ROMANIA S.A. 3.33ms from Bucharest, RO
197.52.226.141 AS8452 TE-AS 4.22ms from Cairo, EG
90.236.162.13 AS3301 Telia Company AB 16.14ms from Copenhagen, DK
34.58.199.45 AS396982 Google LLC 0.12ms from Council Bluffs, US
179.184.66.237 AS18881 TELEFÔNICA BRASIL S.A 13.15ms from Curitiba, BR
104.202.190.45 AS7459 Grande Communications Networks, LLC 8.09ms from Dallas, US
87.175.42.77 AS3320 Deutsche Telekom AG 8.51ms from Frankfurt am Main, DE

Traceroute

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

$
traceroute -a -n -q1 -m5 42.79.170.214
traceroute to 42.79.170.214 (42.79.170.214): 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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