203.239.99.0/24

AS131820 · HMM

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Summary

Country	South Korea
Domain	teleoffice.co.kr
ASN	AS131820
Parent Range	203.239.0.0/17
Registry	KRNIC
ID	203.239.99.0-203.239.100.255

WHOIS Details

inetnum:            203.239.99.0 - 203.239.100.255
descr:              SIHWA
network-type:       CUSTOMER
address:            Jeongwang-dong Siheung Si GYEONGGI-DO
zip-code:           15109
created:            2003-09-06
admin:              GENERATED-KRNIC-IP-MANAGER-LSHTWO
country:            KR
source:             KRNIC

nic-hdl:            GENERATED-KRNIC-IP-MANAGER-LSHTWO
person:             IP Manager
name:               IP Manager
phone:              +82-2-2222-9375
e-mail:             lshtwo@teleoffice.co.kr
source:             KRNIC

Overlapping Ranges

BGP prefixes that contain 203.239.99.0/24

Range	ASN	Company	Num of IPs
203.239.0.0/17	AS131794	SEJONG NETWORKS	32,768
203.239.0.0/17	AS9577	SEJONG NETWORKS	32,768
203.239.0.0/17	AS9848	SEJONG NETWORKS	32,768
203.239.0.0/17	AS131820	SEJONG NETWORKS	32,768
203.239.0.0/17	AS10193	SEJONG NETWORKS	32,768
203.239.0.0/17	AS38686	SEJONG NETWORKS	32,768

Nearby Ranges

BGP prefixes that overlap with 203.239.0.0/16

Range	ASN	Company	Num of IPs
203.239.0.0/17	AS10193	SEJONG NETWORKS	32,768
203.239.0.0/17	AS131794	SEJONG NETWORKS	32,768
203.239.0.0/17	AS131820	SEJONG NETWORKS	32,768
203.239.0.0/17	AS38686	SEJONG NETWORKS	32,768
203.239.0.0/17	AS9577	SEJONG NETWORKS	32,768
203.239.0.0/17	AS9848	SEJONG NETWORKS	32,768
203.239.128.0/18	AS4663	ELIMNET, INC.	16,384
203.239.224.0/19	AS4766	Korea Telecom	8,192
203.239.183.0/24	AS4663	ELIMNET	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

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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
75.182.174.24	AS11426 Charter Communications Inc	`6.66ms` from Charlotte, US
18.158.112.72	AS16509 Amazon.com, Inc.	`0.11ms` from Frankfurt am Main, DE
14.162.21.88	AS45899 VNPT Corp	`1.68ms` from Hanoi, VN
196.29.32.248	AS37183 Utande Internet Services (Pvt) Ltd	`15.27ms` from Johannesburg, ZA
94.94.135.72	AS3269 Telecom Italia S.p.A.	`4.18ms` from Milan, IT
93.109.112.136	AS6866 Cyprus Telecommunications Authority	`2.63ms` from Nicosia, CY
88.60.24.8	AS3269 Telecom Italia S.p.A.	`1.33ms` from Rome, IT
210.91.172.152	AS4766 Korea Telecom	`7.28ms` from Seoul, KR
106.13.220.136	AS38365 Beijing Baidu Netcom Science and Technology Co., Ltd.	`4.56ms` from Shenzhen, CN
140.115.25.40	AS18420 National Central University	`2.78ms` from Taipei, TW
139.219.109.8	AS58593 Shanghai Blue Cloud Technology Co.,Ltd	`3.88ms` from Tianjin, CN
85.152.189.104	AS12946 R Cable y Telecable Telecomunicaciones, S.A.U.	`10.86ms` from A Coruna, ES
20.101.233.216	AS8075 Microsoft Corporation	`0.26ms` from Amsterdam, NL
104.63.211.72	AS7018 AT&T Enterprises, LLC	`8.72ms` from Atlanta, US
49.49.72.40	AS45758 Triple T Broadband Public Company Limited	`10.03ms` from Bangkok, TH
2.98.63.232	AS13285 TalkTalk Communications Limited	`2.91ms` from London, GB
2.136.179.168	AS3352 TELEFONICA DE ESPANA S.A.U.	`3.01ms` from Madrid, ES
27.101.153.184	AS17841 NATIONAL INFORMATION RESOURCES SERVICE	`10.07ms` from Seoul, KR
121.168.117.184	AS4766 Korea Telecom	`1.59ms` from Seoul, KR
125.153.134.8	AS4766 Korea Telecom	`5.50ms` from Seoul, KR
54.95.30.56	AS16509 Amazon.com, Inc.	`0.20ms` from Tokyo, JP
78.88.247.72	AS29314 VECTRA S.A.	`10.42ms` from Warsaw, PL
106.13.103.88	AS38365 Beijing Baidu Netcom Science and Technology Co., Ltd.	`6.25ms` from Beijing, CN
141.55.239.200	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`5.61ms` from Berlin, DE
117.247.201.200	AS9829 National Internet Backbone	`5.37ms` from Chennai, IN

Traceroute

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

traceroute -a -n -q1 -f2 -m15 203.239.99.2

traceroute to 203.239.99.2 (203.239.99.2): 15 hops max, 52 byte packets

2 [AS201106] 172.83.154.81 13.835 ms

3 [] 206.81.81.160 1.29 ms

4 *

5 *

6 *

7 *

8 *

9 [AS9318] 61.254.3.178 118.854 ms

10 [AS131820] 203.239.96.4 119.143 ms

11 [AS131820] 203.239.96.2 117.282 ms

12 [AS131820] 203.239.96.4 119.235 ms

13 *

14 *

15 *

Measurement taken from

IPinfo ProbeNet in Seattle, US

On January 19th 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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