1. All IP Ranges
  2. 221.0.0.0/8
  3. 221.157.0.0/16
  4. AS4766  | 221.157.128.0/23

221.157.128.0/23

AS4766  ·  Korea Telecom

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Summary

Country South Korea
Domain kt.com
ASN AS4766
Parent Range 221.144.0.0/12
Registry APNIC
ID KORNET-KR

WHOIS Details

inetnum:        221.144.0.0 - 221.159.255.255
netname:        KORNET
descr:          Korea Telecom
country:        KR
admin-c:        IM667-AP
tech-c:         IM667-AP
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2025-11-03T08:15:09Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        9, Jinheung-gil, Naju-si, Jeollanam-do
e-mail:         irt@nic.or.kr
abuse-mailbox:  irt@nic.or.kr
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
remarks:        irt@nic.or.kr was validated on 2020-04-09
mnt-by:         MNT-KRNIC-AP
last-modified:  2025-09-04T01:00:01Z
source:         APNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IM667-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2017-03-28T06:37:04Z
source:         APNIC

inetnum:        221.144.0.0 - 221.159.255.255
netname:        KORNET-KR
descr:          Korea Telecom
country:        KR
admin-c:        IA9-KR
tech-c:         IM9-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

Overlapping Ranges

BGP prefixes that contain 221.157.128.0/23

Range ASN Company Num of IPs
221.144.0.0/12 AS9856 Korea Telecom 1,048,576
221.144.0.0/12 AS10185 Korea Telecom 1,048,576
221.144.0.0/12 AS152214 Korea Telecom 1,048,576
221.144.0.0/12 AS17576 Korea Telecom 1,048,576
221.144.0.0/12 AS17851 Korea Telecom 1,048,576
221.144.0.0/12 AS38405 Korea Telecom 1,048,576
221.144.0.0/12 AS38697 Korea Telecom 1,048,576
221.144.0.0/12 AS45360 Korea Telecom 1,048,576
221.144.0.0/12 AS45400 Korea Telecom 1,048,576
221.144.0.0/12 AS4766 Korea Telecom 1,048,576
221.144.0.0/12 AS10184 Korea Telecom 1,048,576
221.144.0.0/12 AS55622 Korea Telecom 1,048,576
221.144.0.0/12 AS9526 Korea Telecom 1,048,576
221.144.0.0/12 AS9850 Korea Telecom 1,048,576

Nearby Ranges

BGP prefixes that overlap with 221.157.0.0/16

Range ASN Company Num of IPs
221.144.0.0/12 AS10184 Korea Telecom 1,048,576
221.144.0.0/12 AS10185 Korea Telecom 1,048,576
221.144.0.0/12 AS152214 Korea Telecom 1,048,576
221.144.0.0/12 AS17576 Korea Telecom 1,048,576
221.144.0.0/12 AS17851 Korea Telecom 1,048,576
221.144.0.0/12 AS38405 Korea Telecom 1,048,576
221.144.0.0/12 AS38697 Korea Telecom 1,048,576
221.144.0.0/12 AS45360 Korea Telecom 1,048,576
221.144.0.0/12 AS45400 Korea Telecom 1,048,576
221.144.0.0/12 AS4766 Korea Telecom 1,048,576
221.144.0.0/12 AS55622 Korea Telecom 1,048,576
221.144.0.0/12 AS9526 Korea Telecom 1,048,576
221.144.0.0/12 AS9850 Korea Telecom 1,048,576
221.144.0.0/12 AS9856 Korea Telecom 1,048,576

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity
Read more

Pingable IPs

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

IP Address ASN Details
221.157.129.254 AS4766 Korea Telecom 5.47ms from Seoul, KR
221.157.128.228 AS4766 Korea Telecom 5.02ms from Seoul, KR

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
178.88.136.247 AS9198 JSC Kazakhtelecom 2.24ms from Almaty, KZ
34.48.139.23 AS396982 Google LLC 0.13ms from Ashburn, US
190.244.18.247 AS7303 Telecom Argentina S.A. 2.14ms from Buenos Aires, AR
184.51.221.23 AS16625 Akamai Technologies, Inc. 0.22ms from Chicago, US
47.5.116.151 AS33588 Charter Communications LLC 7.22ms from Denver, US
3.251.138.167 AS16509 Amazon.com, Inc. 0.42ms from Dublin, IE
113.186.240.135 AS45899 VNPT Corp 2.50ms from Hanoi, VN
221.124.60.119 AS9304 HGC Global Communications Limited 1.18ms from Hong Kong, HK
92.31.199.247 AS13285 TalkTalk Communications Limited 6.42ms from London, GB
82.13.11.183 AS5089 Virgin Media Limited 7.59ms from London, GB
119.170.104.231 AS9824 JCOM Co., Ltd. 17.85ms from Osaka, JP
54.91.90.199 AS14618 Amazon.com, Inc. 0.24ms from Reston, US
76.126.237.55 AS7922 Comcast Cable Communications, LLC 9.06ms from San Jose, US
189.158.70.247 AS8151 UNINET 10.70ms from Santiago de Queretaro, MX
211.226.245.247 AS4766 Korea Telecom 1.71ms from Seoul, KR
1.201.143.119 AS9286 KINX 1.15ms from Seoul, KR
87.96.146.55 AS29518 Bredband2 AB 1.53ms from Stockholm, SE
58.111.248.167 AS4804 Microplex PTY LTD 3.31ms from Sydney, AU
125.110.139.135 AS4134 CHINANET-BACKBONE 10.11ms from Hangzhou, CN
74.208.43.199 AS8560 IONOS SE 0.35ms from Lenexa, US
95.238.209.87 AS3269 Telecom Italia S.p.A. 3.17ms from Milan, IT
123.219.104.103 AS4713 NTT DOCOMO BUSINESS,Inc. 7.21ms from Osaka, JP
37.68.207.247 AS15557 Societe Francaise Du Radiotelephone - SFR SA 10.23ms from Paris, FR
54.183.93.119 AS16509 Amazon.com, Inc. 0.16ms from San Jose, US
187.156.248.183 AS8151 UNINET 16.26ms from Santiago de Queretaro, MX

Traceroute

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

$
traceroute -a -n -q1 221.157.129.254
traceroute to 221.157.129.254 (221.157.129.254): 64 hops max, 52 byte packets
1 [AS31898] 140.91.214.3 0.069 ms
3 *
4 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Seoul, KR
On

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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