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
221.157.128.228 AS4766 Korea Telecom 5.02ms from Seoul, KR
221.157.129.254 AS4766 Korea Telecom 5.47ms 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
66.190.150.183 AS20115 Charter Communications LLC 11.46ms from Atlanta, US
41.142.18.103 AS36903 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM 8.46ms from Casablanca, MA
65.188.183.23 AS11426 Charter Communications Inc 6.24ms from Charlotte, US
171.93.108.247 AS4134 CHINANET-BACKBONE 6.93ms from Chengdu, CN
68.229.149.103 AS22773 Cox Communications Inc. 13.47ms from Dallas, US
86.45.27.71 AS5466 Eircom Limited 1.50ms from Dublin, IE
116.103.36.199 AS24086 Viettel Corporation 10.45ms from Ho Chi Minh City, VN
190.129.123.7 AS6568 EMPRESA NACIONAL DE TELECOMUNICACIONES SOCIEDAD ANONIMA 9.11ms from La Paz, BO
172.114.17.71 AS20001 Charter Communications Inc 6.54ms from Los Angeles, US
47.159.145.183 AS5650 Frontier Communications of America, Inc. 2.77ms from Los Angeles, US
35.183.82.39 AS16509 Amazon.com, Inc. 0.17ms from Montreal, CA
188.126.48.247 AS49368 DomoLAN Ltd. 1.39ms from Moscow, RU
24.21.67.87 AS7922 Comcast Cable Communications, LLC 7.63ms from Portland, US
65.49.142.23 AS13370 Ziply Fiber 1.32ms from Quincy, US
40.91.94.199 AS8075 Microsoft Corporation 0.30ms from Quincy, US
54.91.90.199 AS14618 Amazon.com, Inc. 0.23ms from Reston, US
24.151.107.167 AS20115 Charter Communications LLC 10.29ms from Reston, US
178.44.150.247 AS12389 PJSC Rostelecom 14.56ms from Samara, RU
182.222.134.71 AS17858 LG POWERCOMM 2.01ms from Seoul, KR
183.114.175.247 AS4766 Korea Telecom 1.70ms from Seoul, KR
47.237.99.151 AS45102 Alibaba (US) Technology Co., Ltd. 0.66ms from Singapore, SG
200.207.107.135 AS27699 TELEFÔNICA BRASIL S.A 14.07ms from São Paulo, BR
66.110.240.23 AS22709 North State Telephone, LLC 8.48ms from Ashburn, US
50.29.255.55 AS3737 PenTeleData Inc. 14.37ms from Ashburn, US
84.195.3.247 AS6848 Telenet BV 7.88ms from Brussels, BE

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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