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121.143.66.83

Recent Activity

Abuse Confidence Score

76% Critical

15 reports

15 reporters · latest 14 hours ago

ISP: Korea Telecom
Usage Type: Fixed Line ISP
ASN: AS4766
Domain Name: kt.com
Country: 🇰🇷 Korea (the Republic of)
City: Bucheon-si, Gyeonggi-do

ISP, Usage Type, and Location provided by IPInfo. Updated weekly.

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Abuse Reports

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Total reports

15 from 15 distinct reporters

First reported

October 31st 2026

Most recent report

14 hours ago

Last 60 days

Top reporter locations 🇩🇪 Germany 8 🇫🇷 France 2 🇸🇬 Singapore 2

Most common categories Brute-Force 15 SSH 14 Port Scan 2 Web App Attack 1 Hacking 1

Recent reports We have received reports of abusive activity from this IP address within the last week. It is potentially still actively engaged in abusive activities.

Reporter	IoA Timestamp (UTC)	Comment	Categories
🇩🇪 Hugopvigo	2026-11-07 04:59:29 UTC · (14 hours ago)	2026-11-07T05:59:27.037386+01:00 Travel-Suop sshd[3939256]: Invalid user tangliu from 121.143.66.83 port 41600 2026-11-07T05:59:27.331550+01:00 Travel-Suop sshd[3939256]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruse ... show more 2026-11-07T05:59:27.037386+01:00 Travel-Suop sshd[3939256]: Invalid user tangliu from 121.143.66.83 port 41600 2026-11-07T05:59:27.331550+01:00 Travel-Suop sshd[3939256]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 2026-11-07T05:59:29.290097+01:00 Travel-Suop sshd[3939256]: Failed password for invalid user tangliu from 121.143.66.83 port 41600 ssh2 ... show less	Hacking Brute-Force Web App Attack SSH
🇩🇪 Inamin	2026-11-06 17:02:51 UTC · (1 day ago)	2026-11-07T01:02:29.587699 v2202206178488194055 sshd-session[504772]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-07T01:02:31.591564 v2202206178488194055 sshd-session[504772 ... show more 2026-11-07T01:02:29.587699 v2202206178488194055 sshd-session[504772]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-07T01:02:31.591564 v2202206178488194055 sshd-session[504772]: Failed password for root from 121.143.66.83 port 51504 ssh2 2026-11-07T01:02:50.314661 v2202206178488194055 sshd-session[504782]: Invalid user szernet from 121.143.66.83 port 59038 ... show less	Port Scan Brute-Force
🇵🇱 Ferron	2026-11-05 20:10:52 UTC · (1 day ago)	2026-11-05T22:09:34.760105+02:00 smtp-01.hosts.ferron.sh sshd-session[899204]: Invalid user user23 from 121.143.66.83 port 48482 2026-11-05T22:09:53.790453+02:00 smtp-01.hosts.ferron.sh sshd-session[899309]: Invalid user haoyuan from 121.143.66.83 po ... show more 2026-11-05T22:09:34.760105+02:00 smtp-01.hosts.ferron.sh sshd-session[899204]: Invalid user user23 from 121.143.66.83 port 48482 2026-11-05T22:09:53.790453+02:00 smtp-01.hosts.ferron.sh sshd-session[899309]: Invalid user haoyuan from 121.143.66.83 port 41746 2026-11-05T22:10:11.505555+02:00 smtp-01.hosts.ferron.sh sshd-session[899403]: Invalid user renjie from 121.143.66.83 port 58830 2026-11-05T22:10:30.312045+02:00 smtp-01.hosts.ferron.sh sshd-session[899514]: Invalid user wangm from 121.143.66.83 port 47608 2026-11-05T22:10:51.295469+02:00 smtp-01.hosts.ferron.sh sshd-session[899647]: Invalid user licong from 121.143.66.83 port 54236 ... show less	Brute-Force SSH
🇺🇸 Ssmidge	2026-11-05 20:09:28 UTC · (1 day ago)	Nov 5 15:09:24 vps-6 sshd[849417]: Invalid user user23 from 121.143.66.83 port 40400 Nov 5 15:09:25 vps-6 sshd[849417]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 Nov 5 15:09:27 vps-6 ssh ... show more Nov 5 15:09:24 vps-6 sshd[849417]: Invalid user user23 from 121.143.66.83 port 40400 Nov 5 15:09:25 vps-6 sshd[849417]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 Nov 5 15:09:27 vps-6 sshd[849417]: Failed password for invalid user user23 from 121.143.66.83 port 40400 ssh2 ... show less	Brute-Force SSH
🇩🇪 lenz	2026-11-05 08:14:59 UTC · (2 days ago)	2026-11-05T09:14:19.031041+01:00 mail.lenzdevelopment.pl sshd-session[2368193]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 2026-11-05T09:14:20.766550+01:00 mail.lenzdevelopment.pl sshd-sessio ... show more 2026-11-05T09:14:19.031041+01:00 mail.lenzdevelopment.pl sshd-session[2368193]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 2026-11-05T09:14:20.766550+01:00 mail.lenzdevelopment.pl sshd-session[2368193]: Failed password for invalid user weh2018 from 121.143.66.83 port 44126 ssh2 2026-11-05T09:14:38.857032+01:00 mail.lenzdevelopment.pl sshd-session[2368712]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-05T09:14:40.924666+01:00 mail.lenzdevelopment.pl sshd-session[2368712]: Failed password for root from 121.143.66.83 port 56976 ssh2 2026-11-05T09:14:58.469438+01:00 mail.lenzdevelopment.pl sshd-session[2369173]: Invalid user user from 121.143.66.83 port 53182 ... show less	Brute-Force SSH
🇸🇬 Mary Barnhart	2026-11-05 04:18:40 UTC · (2 days ago)	2026-11-05T12:18:19.446137+08:00 localhost sshd[4279]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-05T12:18:21.495678+08:00 localhost sshd[4279]: Failed password for root fr ... show more 2026-11-05T12:18:19.446137+08:00 localhost sshd[4279]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-05T12:18:21.495678+08:00 localhost sshd[4279]: Failed password for root from 121.143.66.83 port 45884 ssh2 2026-11-05T12:18:39.672252+08:00 localhost sshd[4282]: Invalid user lina from 121.143.66.83 port 35728 ... show less	Brute-Force SSH
🇩🇪 gottschall.com.de	2026-11-04 19:57:30 UTC · (2 days ago)	2026-11-04T21:56:49.717035+02:00 sleipnir sshd-session[2956248]: Invalid user marong from 121.143.66.83 port 59102 2026-11-04T21:57:10.886161+02:00 sleipnir sshd-session[2956267]: Invalid user xzg from 121.143.66.83 port 60134 2026-11-04T21:57:29.329 ... show more 2026-11-04T21:56:49.717035+02:00 sleipnir sshd-session[2956248]: Invalid user marong from 121.143.66.83 port 59102 2026-11-04T21:57:10.886161+02:00 sleipnir sshd-session[2956267]: Invalid user xzg from 121.143.66.83 port 60134 2026-11-04T21:57:29.329328+02:00 sleipnir sshd-session[2956320]: Invalid user xjx from 121.143.66.83 port 42478 ... show less	Brute-Force SSH
Anonymous	2026-11-04 11:32:04 UTC · (3 days ago)	Nov 4 12:31:42 server3 sshd[3821536]: User root from 121.143.66.83 not allowed because listed in DenyUsers Nov 4 12:31:43 server3 sshd[3821536]: Failed password for invalid user root from 121.143.66.83 port 45464 ssh2 Nov 4 12:32:03 server3 sshd[3 ... show more Nov 4 12:31:42 server3 sshd[3821536]: User root from 121.143.66.83 not allowed because listed in DenyUsers Nov 4 12:31:43 server3 sshd[3821536]: Failed password for invalid user root from 121.143.66.83 port 45464 ssh2 Nov 4 12:32:03 server3 sshd[3821589]: Invalid user dygod from 121.143.66.83 port 38712 ... show less	Brute-Force SSH
🇫🇷 SouperCat	2026-11-04 07:28:38 UTC · (3 days ago)	2026-11-04T08:28:19.048250+01:00 prod-02 sshd[2212894]: Failed password for root from 121.143.66.83 port 48588 ssh2 2026-11-04T08:28:37.145998+01:00 prod-02 sshd[2212896]: Invalid user dkchen from 121.143.66.83 port 40232 ...	Brute-Force SSH
🇩🇪 ghostwarriors	2026-11-03 14:50:32 UTC · (4 days ago)	Unauthorized connection attempt detected, SSH Brute-Force	Brute-Force Port Scan SSH
🇩🇪 Ma3X Ma3X	2026-11-03 14:36:37 UTC · (4 days ago)	2026-11-03T18:05:58.641373+03:30 codictive sshd-session[229705]: Invalid user gpulab from 121.143.66.83 port 38250 2026-11-03T18:06:18.197520+03:30 codictive sshd-session[229707]: Invalid user zhouxy from 121.143.66.83 port 40790 2026-11-03T18:06:36. ... show more 2026-11-03T18:05:58.641373+03:30 codictive sshd-session[229705]: Invalid user gpulab from 121.143.66.83 port 38250 2026-11-03T18:06:18.197520+03:30 codictive sshd-session[229707]: Invalid user zhouxy from 121.143.66.83 port 40790 2026-11-03T18:06:36.510502+03:30 codictive sshd-session[229709]: Invalid user priyanka from 121.143.66.83 port 43642 ... show less	Brute-Force SSH
Anonymous	2026-11-02 17:14:19 UTC · (5 days ago)	2026-11-02T18:13:56.607480+01:00 dornberger.it sshd-session[2551908]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-02T18:13:57.753350+01:00 dornberger.it sshd-session[2551908 ... show more 2026-11-02T18:13:56.607480+01:00 dornberger.it sshd-session[2551908]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-11-02T18:13:57.753350+01:00 dornberger.it sshd-session[2551908]: Failed password for invalid user root from 121.143.66.83 port 37874 ssh2 2026-11-02T18:14:18.307907+01:00 dornberger.it sshd-session[2552636]: Invalid user grid from 121.143.66.83 port 54076 ... show less	Brute-Force SSH
🇫🇷 Baking333	2026-11-02 07:50:41 UTC · (5 days ago)	Nov 2 08:50:22 vmi2194164 sshd[1599924]: Failed password for root from 121.143.66.83 port 36514 ssh2 Nov 2 08:50:41 vmi2194164 sshd[1600018]: Invalid user gdddc from 121.143.66.83 port 46268	Brute-Force SSH
🇻🇳 edata-vn	2026-11-01 15:15:02 UTC · (6 days ago)	2026-11-01T22:14:02.423777+07:00 Invalid user wangys from 121.143.66.83 port 45084	Brute-Force SSH
🇸🇬 orangevps.com	2026-10-31 08:05:26 UTC · (1 week ago)	2026-10-31T16:05:08.558321 redacted sshd[2302256]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-10-31T16:05:10.142782 redacted sshd[2302256]: Failed password for invalid user ro ... show more 2026-10-31T16:05:08.558321 redacted sshd[2302256]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.143.66.83 user=root 2026-10-31T16:05:10.142782 redacted sshd[2302256]: Failed password for invalid user root from 121.143.66.83 port 34010 ssh2 2026-10-31T16:05:23.849605 redacted sshd[2302260]: Invalid user mzc from 121.143.66.83 port 47072 show less	Brute-Force SSH

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