210.104.140.0/24

AS17841 · NATIONAL INFORMATION RESOURCES SERVICE

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Summary

Country	South Korea
Domain	kt.com
ASN	AS17841
Registry	APNIC
ID	KORNET

WHOIS Details

inetnum:        210.104.128.0 - 210.104.143.255
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:  2025-11-03T08:14:27Z
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:        210.104.128.0 - 210.104.143.255
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

Nearby Ranges

BGP prefixes that overlap with 210.104.0.0/16

Range	ASN	Company	Num of IPs
210.104.10.0/24	AS45400	Korea Telecom	256
210.104.11.0/24	AS45400	Korea Telecom	256
210.104.12.0/24	AS45400	Korea Telecom	256
210.104.123.0/24	AS45400	Korea Telecom	256
210.104.13.0/24	AS45400	Korea Telecom	256
210.104.138.0/24	AS45400	Korea Telecom	256
210.104.14.0/24	AS45400	Korea Telecom	256
210.104.15.0/24	AS45400	Korea Telecom	256
210.104.20.0/24	AS45400	Korea Telecom	256
210.104.22.0/24	AS45400	Korea Telecom	256
210.104.26.0/24	AS45400	Korea Telecom	256
210.104.27.0/24	AS45400	Korea Telecom	256
210.104.28.0/24	AS45400	Korea Telecom	256
210.104.44.0/24	AS45400	Korea Telecom	256
210.104.8.0/24	AS45400	Korea Telecom	256
210.104.9.0/24	AS45400	Korea Telecom	256
210.104.32.0/24	AS4766	ETRIbuseolgukgaboangisulyeonguso	256
210.104.33.0/24	AS4766	ETRIbuseolgukgaboangisulyeonguso	256
210.104.34.0/24	AS4766	KT	256
210.104.39.0/24	AS4766	Samhwajeongi(ju)	256
210.104.21.0/24	AS9683	KT	256

Hosted domains

There are 3 domain names hosted across 3 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
210.104.140.170	coast.go.kr	1
210.104.140.138	newjijuk.go.kr	1
210.104.140.145	shipowners.go.kr	1

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

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

IP Address	ASN	Details
210.104.140.138	AS17841 NATIONAL INFORMATION RESOURCES SERVICE	`3.82ms` 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
189.172.159.248	AS8151 UNINET	`12.20ms` from Cancún, MX
182.141.51.24	AS4134 CHINANET-BACKBONE	`5.56ms` from Chengdu, CN
104.6.169.24	AS7018 AT&T Enterprises, LLC	`6.41ms` from Chicago, US
124.72.53.24	AS4134 CHINANET-BACKBONE	`6.00ms` from Fuzhou, CN
49.44.38.72	AS55836 Reliance Jio Infocomm Limited	`0.91ms` from Lohogaon, IN
176.255.59.168	AS5607 Sky UK Limited	`1.78ms` from London, GB
112.230.21.120	AS4837 CHINA UNICOM China169 Backbone	`6.24ms` from Qingdao, CN
131.106.58.8	AS6079 RCN	`7.41ms` from Secaucus, US
80.84.18.56	AS6774 Belgacom International Carrier Services SA	`0.34ms` from Singapore, SG
95.211.169.88	AS60781 LeaseWeb Netherlands B.V.	`0.25ms` from Amsterdam, NL
108.141.105.184	AS8075 Microsoft Corporation	`0.20ms` from Amsterdam, NL
52.92.243.216	AS16509 Amazon.com, Inc.	`0.45ms` from Boardman, US
75.155.69.24	AS852 TELUS Communications Inc.	`10.05ms` from Calgary, CA
204.56.19.24	AS55154 Madgenius.com	`1.05ms` from Chicago, US
90.193.152.168	AS5607 Sky UK Limited	`3.40ms` from Erith, GB
3.79.109.72	AS16509 Amazon.com, Inc.	`0.16ms` from Frankfurt am Main, DE
121.32.182.88	AS4134 CHINANET-BACKBONE	`1.74ms` from Guangzhou, CN
1.205.97.40	AS4134 CHINANET-BACKBONE	`3.30ms` from Guiyang, CN
58.176.172.72	AS9269 Hong Kong Broadband Network Ltd.	`0.77ms` from Hong Kong, HK
86.173.190.24	AS2856 British Telecommunications PLC	`7.27ms` from London, GB
86.182.73.152	AS2856 British Telecommunications PLC	`5.94ms` from London, GB
107.183.45.248	AS6661 POST Luxembourg	`1.02ms` from Luxembourg, LU
79.148.185.216	AS3352 TELEFONICA DE ESPANA S.A.U.	`1.53ms` from Madrid, ES
18.102.243.200	AS16509 Amazon.com, Inc.	`0.14ms` from Milan, IT
185.200.18.200	AS56923 Virtualfort OOO	`7.68ms` from Samara, RU

Traceroute

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

traceroute -a -n -q1 210.104.140.138

traceroute to 210.104.140.138 (210.104.140.138): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.45 0.08 ms

2 [AS3786] 211.118.152.142 14.252 ms

3 *

4 [AS3786] 1.208.168.201 2.625 ms

5 [AS3786] 1.208.179.130 2.24 ms

6 [AS3786] 210.107.53.202 4.03 ms

7 *

8 *

9 *

10 *

11 [AS17841] 210.104.140.138 4.184 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 30th 2026

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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