121.128.55.0/24

AS9647 · Seoul Metropolitan Government

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Summary

Country	South Korea
Domain	kt.com
ASN	AS9647
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 121.128.55.0/24

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

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

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

IP Address	ASN	Details
121.128.55.155	AS9647 Seoul Metropolitan Government	`1.57ms` 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
23.245.13.232	AS11776 Breezeline	`8.07ms` from Ashburn, US
108.26.127.72	AS701 Verizon Business	`7.46ms` from Ashburn, US
18.161.213.136	AS16509 Amazon.com, Inc.	`0.70ms` from Bengaluru, IN
188.26.176.248	AS8708 DIGI ROMANIA S.A.	`0.92ms` from Bucharest, RO
52.123.155.8	AS8075 Microsoft Corporation	`0.15ms` from Cardiff, GB
3.17.0.88	AS16509 Amazon.com, Inc.	`0.19ms` from Columbus, US
38.141.238.136	AS35986 Vyve Broadband	`8.13ms` from Dallas, US
67.215.47.104	AS15305 Syringa Networks, LLC	`5.84ms` from Draper, US
78.43.253.184	AS3209 Vodafone GmbH	`9.53ms` from Frankfurt am Main, DE
89.144.25.40	AS58212 dataforest GmbH	`0.54ms` from Frankfurt am Main, DE
14.166.22.216	AS45899 VNPT Corp	`1.91ms` from Hanoi, VN
15.253.27.88	AS16509 Amazon.com, Inc.	`1.15ms` from Los Angeles, US
132.239.79.8	AS7377 University of California, San Diego	`2.73ms` from Los Angeles, US
76.20.65.72	AS7922 Comcast Cable Communications, LLC	`10.22ms` from Los Angeles, US
122.54.181.216	AS9299 Philippine Long Distance Telephone Company	`0.67ms` from Manila, PH
37.23.201.72	AS12389 PJSC Rostelecom	`5.43ms` from Novosibirsk, RU
95.181.71.136	AS39927 E-Light-Telecom Ltd.	`6.32ms` from Novosibirsk, RU
54.166.184.104	AS14618 Amazon.com, Inc.	`0.24ms` from Reston, US
24.16.94.24	AS7922 Comcast Cable Communications, LLC	`4.99ms` from Seattle, US
46.195.56.56	AS8434 Telenor Sverige AB	`11.16ms` from Stockholm, SE
126.69.213.120	AS17676 SoftBank Corp.	`6.58ms` from Tokyo, JP
124.207.98.24	AS4808 China Unicom Beijing Province Network	`4.83ms` from Beijing, CN
156.216.251.120	AS8452 TE-AS	`3.69ms` from Cairo, EG
208.59.110.136	AS6079 RCN	`7.22ms` from Chicago, US
173.175.229.56	AS11427 Charter Communications Inc	`4.03ms` from Dallas, US

Traceroute

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

traceroute -a -n -q1 -f5 -m14 121.128.55.242

traceroute to 121.128.55.242 (121.128.55.242): 14 hops max, 52 byte packets

5 [AS4766] 112.174.87.249 264.174 ms

6 [AS4766] 112.174.86.133 263.894 ms

7 *

8 *

9 *

10 [AS4766] 211.217.66.82 279.803 ms

11 [AS9647] 202.14.90.137 245.053 ms

12 *

13 *

14 *

Measurement taken from

IPinfo ProbeNet in Warsaw, PL

On December 14th 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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