172.81.104.0/24

AS400618 · Prime Security Corp.

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Summary

Country	Hong Kong
Domain	ctcsci.com
ASN	AS400618
Registry	ARIN
ID	CTCSCI

WHOIS Details

NetHandle:      NET-172-81-104-0-1
OrgID:          C10193922
Parent:         NET-172-81-96-0-1
NetName:        CTCSCI
NetRange:       172.81.104.0 - 172.81.111.255
NetType:        reassignment
RegDate:        2023-09-25
Updated:        2023-11-30
Source:         ARIN


OrgID:          C10193922
OrgName:        CTCSCI TECH LIMITED
CanAllocate:    
Street:         RM 023, 9/F BLK G KWAI SHING IND BLDG, 42-46
Street:         TAI LIN PAI RD, KWAI CHUNG
City:           New Territories
State/Prov:     
Country:        HK
PostalCode:     
RegDate:        2023-09-25
Updated:        2023-09-25
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 172.81.0.0/16

Range	ASN	Company	Num of IPs
172.81.192.0/18	AS45090	Tencent Cloud Computing (Beijing) Co., Ltd	16,384
172.81.64.0/20	AS32592	Uniti Fiber Holdings Inc.	4,096
172.81.64.0/20	AS13760	Uniti Fiber Holdings Inc.	4,096
172.81.160.0/20	AS14265	TPx Communications	4,096
172.81.176.0/21	AS394745	Lunanode Hosting Inc.	2,048
172.81.176.0/21	AS394745	Lunanode Hosting Inc.	2,048
172.81.120.0/21	AS21859	Zenlayer Inc	2,048
172.81.176.0/21	AS174	Lunanode Hosting Inc.	2,048
172.81.176.0/21	AS174	Lunanode Hosting Inc.	2,048
172.81.140.0/22	AS36498	Access One Inc.	1,024
172.81.4.0/22	AS30417	BTIG LLC	1,024
172.81.136.0/22	AS32924	Greenway Health, LLC	1,024
172.81.44.0/22	AS399290	Infinilink Broadband	1,024
172.81.48.0/22	AS19740	LINKSECURED LLC	1,024
172.81.52.0/22	AS396107	Southern Broadband, LLC	1,024
172.81.148.0/22	AS63023	Sardis Telecom	1,024
172.81.152.0/22	AS54858	Wave Broadband	1,024
172.81.24.0/22	AS19528	QUESTHOST.COM, LLC	1,024
172.81.20.0/22	AS399091	Inter Data Link Inc	1,024
172.81.156.0/22	AS14265	TPx Communications	1,024
172.81.188.0/22	AS32354	Unwired	1,024
172.81.116.0/22	AS54641	InMotion Hosting, Inc.	1,024
172.81.28.0/22	AS399194	Satronics Satellites Sales and Service	1,024
172.81.16.0/22	AS18519	MTC Technologies	1,024
172.81.38.0/23	AS397095	Setson LLC	512
172.81.9.0/24	AS46480	Pekin Insurance	256
172.81.127.0/24	AS21859	ZENLA-1	256
172.81.127.0/24	AS21859	ZENLA-1	256
172.81.127.0/24	AS62610	ZENLA-1	256
172.81.127.0/24	AS62610	ZENLA-1	256
172.81.128.0/24	AS27176	DataWagon, LLC	256
172.81.129.0/24	AS27176	DataWagon, LLC	256
172.81.131.0/24	AS27176	DataWagon, LLC	256
172.81.134.0/24	AS27176	DataWagon, LLC	256
172.81.135.0/24	AS27176	DataWagon, LLC	256
172.81.139.0/24	AS16509	Greenway Health, LLC	256
172.81.144.0/24	AS212238	bvoip	256
172.81.145.0/24	AS212238	bvoip	256
172.81.146.0/24	AS212238	bvoip	256
172.81.147.0/24	AS212238	bvoip	256
172.81.36.0/24	AS399218	R B & W CORPORATION OF CANADA	256
172.81.37.0/24	AS62943	DataTenant, LLC	256
172.81.4.0/24	AS30417	BTIG LLC	256
172.81.57.0/24	AS399275	SOLID-PHOENIX	256
172.81.59.0/24	AS399275	SOLID SYSTEMS LLC	256
172.81.75.0/24	AS36730	Transformyx, Inc.	256
172.81.8.0/24	AS7819	Ark Network, Inc.	256

Hosted domains

There is 1 domain name hosted across 1 IP address on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
172.81.104.89	bitbest-kr.com	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

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

IP Address	ASN	Details
172.81.104.2	AS400618 Prime Security Corp.	`0.28ms` from Hong Kong, HK

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
40.121.147.88	AS8075 Microsoft Corporation	`0.44ms` from Ashburn, US
178.148.87.168	AS31042 Serbia BroadBand-Srpske Kablovske mreze d.o.o.	`8.44ms` from Belgrade, RS
69.207.165.120	AS11351 Charter Communications Inc	`17.79ms` from Chicago, US
66.38.76.136	AS11979 Bluegrass Network LLC	`12.67ms` from Chicago, US
34.69.190.248	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
87.122.207.40	AS8881 1&1 Versatel Deutschland GmbH	`7.40ms` from Frankfurt am Main, DE
147.139.179.136	AS45102 Alibaba (US) Technology Co., Ltd.	`0.38ms` from Jakarta, ID
80.26.175.200	AS3352 TELEFONICA DE ESPANA S.A.U.	`2.72ms` from Madrid, ES
73.164.123.56	AS7922 Comcast Cable Communications, LLC	`7.28ms` from Minneapolis, US
91.158.136.56	AS719 Elisa Oyj	`11.21ms` from Oulu, FI
88.172.191.120	AS12322 Free SAS	`3.35ms` from Paris, FR
63.195.8.40	AS7018 AT&T Enterprises, LLC	`6.27ms` from Redding, US
54.215.219.248	AS16509 Amazon.com, Inc.	`0.11ms` from San Jose, US
83.226.141.56	AS2119 Telenor Norge AS	`0.93ms` from Stockholm, SE
99.245.99.168	AS812 Rogers Communications Canada Inc.	`4.12ms` from Toronto, CA
217.96.151.232	AS5617 Orange Polska Spolka Akcyjna	`4.19ms` from Warsaw, PL
84.82.180.40	AS1136 KPN B.V.	`1.33ms` from Amsterdam, NL
193.3.27.8	AS206389 Menno van Krimpen trading as Libernet	`4.12ms` from Amsterdam, NL
176.138.47.200	AS5410 Bouygues Telecom SA	`14.47ms` from Aubervilliers, FR
151.232.165.8	AS58224 Iran Telecommunication Company PJS	`14.93ms` from Az Za`ayin, QA
119.48.163.56	AS4837 CHINA UNICOM China169 Backbone	`14.80ms` from Liaoyang, CN
117.63.129.152	AS4134 CHINANET-BACKBONE	`6.47ms` from Nanjing, CN
49.51.196.120	AS132203 Tencent Building, Kejizhongyi Avenue	`0.24ms` from San Jose, US
61.77.155.88	AS4766 Korea Telecom	`1.48ms` from Seoul, KR
123.215.71.232	AS9318 SK Broadband Co Ltd	`3.64ms` 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 172.81.104.233

traceroute to 172.81.104.233 (172.81.104.233): 64 hops max, 52 byte packets

1 [AS15169] 64.233.174.23 35.221 ms

2 *

3 *

4 [AS142611] 103.170.210.248 37.243 ms

5 *

6 *

7 *

8 *

9 [AS400618] 172.81.104.233 33.803 ms

Measurement taken from

IPinfo ProbeNet in Singapore, SG

On September 11th 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.

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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