121.128.225.0/24

AS38122 · Seoul Guarantee Insurance Company

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Summary

Country	South Korea
Domain	kt.com
ASN	AS38122
Parent Range	121.128.0.0/11
Registry	APNIC
ID	KORNET

WHOIS Details

inetnum:        121.128.0.0 - 121.159.255.255
netname:        KORNET
descr:          Korea Telecom
admin-c:        IM667-AP
tech-c:         IM667-AP
country:        KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
changed:        [email protected] 20170203
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Seoul Songpa-gu Jungdae-ro 135
e-mail:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 20150513
source:         APNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
country:        KR
phone:          +82-2-500-6630
e-mail:         [email protected]
nic-hdl:        IM667-AP
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 20170328
source:         APNIC

inetnum:        121.128.0.0 - 121.159.255.255
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.krnic.net.
changed:        [email protected]
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        
country:        KR
phone:          +82-2-500-6630
e-mail:         [email protected]
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected]
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        
country:        KR
phone:          +82-2-500-6630
e-mail:         [email protected]
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected]
source:         KRNIC

Overlapping Ranges

BGP prefixes that contain 121.128.225.0/24

Range	ASN	Company	Num of IPs
121.128.0.0/11	AS17588	Korea Telecom	2,097,152
121.128.0.0/11	AS18333	Korea Telecom	2,097,152
121.128.0.0/11	AS38122	Korea Telecom	2,097,152
121.128.0.0/11	AS4766	Korea Telecom	2,097,152
121.128.0.0/11	AS9647	Korea Telecom	2,097,152
121.128.0.0/11	AS9856	Korea Telecom	2,097,152

Nearby Ranges

BGP prefixes that overlap with 121.128.0.0/16

Range	ASN	Company	Num of IPs
121.128.0.0/11	AS9856	Korea Telecom	2,097,152
121.128.0.0/11	AS17588	Korea Telecom	2,097,152
121.128.0.0/11	AS18333	Korea Telecom	2,097,152
121.128.0.0/11	AS38122	Korea Telecom	2,097,152
121.128.0.0/11	AS4766	Korea Telecom	2,097,152
121.128.0.0/11	AS9647	Korea Telecom	2,097,152
121.128.219.0/24	AS9647	Korea Telecom	256
121.128.97.0/24	AS152214	Korea Telecom	256

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

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Pingable IPs

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
23.7.57.56	AS16625 Akamai Technologies, Inc.	`0.47ms` from Atlanta, US
23.117.217.136	AS7018 AT&T Enterprises, LLC	`11.02ms` from Atlanta, US
103.246.16.168	AS131447 POPIDC powered by CSLoxinfo	`1.03ms` from Bangkok, TH
134.2.161.136	AS553 BelWue-Koordination	`6.16ms` from Frankfurt am Main, DE
182.65.141.120	AS24560 Bharti Airtel Ltd., Telemedia Services	`14.03ms` from Kolkata, IN
77.47.170.24	AS25500 User Association of Ukrainian Research and Academic Network URAN	`0.55ms` from Kyiv, UA
81.103.57.72	AS5089 Virgin Media Limited	`9.43ms` from London, GB
88.20.14.56	AS3352 TELEFONICA DE ESPANA S.A.U.	`9.19ms` from Madrid, ES
79.228.183.248	AS3320 Deutsche Telekom AG	`3.88ms` from Nuernberg, DE
92.170.212.104	AS3215 Orange S.A.	`5.23ms` from Paris, FR
3.90.154.56	AS14618 Amazon.com, Inc.	`0.51ms` from Reston, US
37.112.165.104	AS51035 JSC ER-Telecom Holding	`7.69ms` from Samara, RU
126.150.38.24	AS17676 SoftBank Corp.	`3.28ms` from Tokyo, JP
4.157.200.152	AS8075 Microsoft Corporation	`0.59ms` from Ashburn, US
39.96.25.88	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`1.33ms` from Beijing, CN
60.5.34.24	AS4837 CHINA UNICOM China169 Backbone	`9.91ms` from Beijing, CN
102.97.24.200	AS36925 MEDITELECOM	`6.83ms` from Casablanca, MA
204.80.212.152	AS2386 AT&T Enterprises, LLC	`9.43ms` from Chicago, US
47.113.135.88	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`0.11ms` from Heyuan, CN
185.25.62.136	AS8496 Optibit LLC	`0.22ms` from Krasnoyarsk, RU
13.135.71.24	AS16509 Amazon.com, Inc.	`0.18ms` from London, GB
125.106.158.104	AS4134 CHINANET-BACKBONE	`6.41ms` from Ningbo, CN
73.215.243.152	AS7922 Comcast Cable Communications, LLC	`11.84ms` from Secaucus, US
203.232.195.248	AS18028 GyeongSang National University	`7.84ms` from Seoul, KR
118.37.50.248	AS4766 Korea Telecom	`1.04ms` from Seoul, KR

Traceroute

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

traceroute -a -n -q1 -f3 -m7 121.128.225.108

traceroute to 121.128.225.108 (121.128.225.108): 7 hops max, 52 byte packets

3 [AS29467] 153.92.62.6 0.701 ms

4 [AS29467] 153.92.62.7 0.64 ms

5 *

6 *

7 *

Measurement taken from

IPinfo ProbeNet in Luxembourg, LU

On December 20th 2025

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.

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