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AbuseIPDB » 210.222.43.21

210.222.43.21 was found in our database!

This IP was reported 235 times. Confidence of Abuse is 100%: ?

100%

ISP	Korea Telecom
Usage Type	Fixed Line ISP
ASN	AS4766
Domain Name	kt.com
Country	🇰🇷 Korea (the Republic of)
City	Seoul, Seoul

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

Report 210.222.43.21

Whois 210.222.43.21

IP Abuse Reports for 210.222.43.21:

This IP address has been reported a total of 235 times from 145 distinct sources. 210.222.43.21 was first reported on July 1st 2025, and the most recent report was 1 day ago.

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
Anonymous	2026-06-19 03:26:13 (1 day ago)	Portscan: TCP/25 (2x), TCP/2525 (2x), TCP/587, TCP/465	Port Scan
🇳🇱 Alboweb B.V.	2026-06-18 14:11:42 (1 day ago)	SMTP brute-force detected by Fail2Ban in plesk-postfix jail	Email Spam Brute-Force
🇩🇪 Click-Networks	2026-06-18 14:10:24 (1 day ago)	Jun 18 13:16:24 wh02 postfix/smtpd[257399]: connect from unknown[210.222.43.21] Jun 18 13:16:24 wh02 ... show more Jun 18 13:16:24 wh02 postfix/smtpd[257399]: connect from unknown[210.222.43.21] Jun 18 13:16:24 wh02 postfix/smtpd[257399]: lost connection after CONNECT from unknown[210.222.43.21] Jun 18 13:16:24 wh02 postfix/smtpd[257399]: disconnect from unknown[210.222.43.21] commands=0/0 Jun 18 15:31:48 wh02 postfix/smtpd[447154]: connect from unknown[210.222.43.21] Jun 18 15:31:49 wh02 postfix/smtpd[447154]: warning: unknown[210.222.43.21]: SASL PLAIN authentication failed: authentication failure, [email protected] Jun 18 15:31:50 wh02 postfix/smtpd[447154]: lost connection after AUTH from unknown[210.222.43.21] Jun 18 15:31:50 wh02 postfix/smtpd[447154]: disconnect from unknown[210.222.43.21] ehlo=2 starttls=1 auth=0/1 commands=3/4 Jun 18 15:33:46 wh02 postfix/smtpd[447377]: connect from unknown[210.222.43.21] Jun 18 15:33:48 wh02 postfix/smtpd[447377]: warning: unknown[210.222.43.21]: SASL PLAIN authentication failed: authentication failure, sasl_username=mail@leon-ebersmann show less	Email Spam Brute-Force Exploited Host
🇩🇪 LRob.fr	2026-06-18 13:45:13 (1 day ago)	SMTP brute-force detected by Fail2Ban in plesk-postfix jail	Email Spam Brute-Force
Anonymous	2026-06-18 13:37:18 (1 day ago)	(smtpauth) Failed SMTP AUTH login from 210.222.43.21 (KR/South Korea/-): 5 in the last 3600 secs; Po ... show more (smtpauth) Failed SMTP AUTH login from 210.222.43.21 (KR/South Korea/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SMTPAUTH; Logs: 2026-06-18 15:32:58 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 15:34:23 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 15:35:24 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 15:36:24 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 15:37:17 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) show less	Port Scan
Anonymous	2026-06-18 13:37:03 (1 day ago)	(smtpauth) Failed SMTP AUTH login from 210.222.43.21 (KR/South Korea/-)	Brute-Force
Anonymous	2026-06-18 09:59:28 (1 day ago)	(smtpauth) Failed SMTP AUTH login from 210.222.43.21 (KR/South Korea/-): 5 in the last 3600 secs; Po ... show more (smtpauth) Failed SMTP AUTH login from 210.222.43.21 (KR/South Korea/-): 5 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_SMTPAUTH; Logs: 2026-06-18 11:56:27 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 11:57:41 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 11:58:19 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 11:58:53 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) 2026-06-18 11:59:26 plain authenticator failed for H=(DESKTOP-K1AT0PB) [210.222.43.21]: 535 Incorrect authentication data ([email protected]) show less	Port Scan
🇩🇪 rh24	2026-06-17 22:49:38 (2 days ago)	(smtpauth) Failed SMTP AUTH login from 210.222.43.21 (KR/South Korea/-)	Brute-Force
🇩🇪 triple-web.net	2026-06-17 22:34:46 (2 days ago)	$f2bV_matches	Brute-Force
🇩🇪 tall1oN	2026-06-17 22:33:04 (2 days ago)	2026-06-18T00:31:27.975604+02:00 kenny dovecot: auth-worker(1018090): conn unix:auth-worker (pid=101 ... show more 2026-06-18T00:31:27.975604+02:00 kenny dovecot: auth-worker(1018090): conn unix:auth-worker (pid=1011614,uid=107): auth-worker<1>: sql([email protected],210.222.43.21): Password mismatch 2026-06-18T00:31:30.111905+02:00 kenny dovecot: auth-worker(1018090): conn unix:auth-worker (pid=1011614,uid=107): auth-worker<2>: pam([email protected],210.222.43.21): pam_authenticate() failed: Authentication failure (Password mismatch?) 2026-06-18T00:33:03.940388+02:00 kenny dovecot: auth-worker(1018339): conn unix:auth-worker (pid=1011614,uid=107): auth-worker<1>: sql([email protected],210.222.43.21): Password mismatch ... show less	Brute-Force Email Spam
🇩🇪 ghostwarriors	2026-06-17 22:31:25 (2 days ago)	Attempts against SMTP/SSMTP	Brute-Force Web App Attack
🇳🇱 e.fierstra	2026-06-17 18:22:37 (2 days ago)	Failed SMTP logins	Brute-Force
🇩🇪 Tha_14	2026-06-17 18:20:01 (2 days ago)	Jun 17 20:14:55 hosting postfix/submission/smtpd[3585082]: warning: unknown[210.222.43.21]: SASL PLA ... show more Jun 17 20:14:55 hosting postfix/submission/smtpd[3585082]: warning: unknown[210.222.43.21]: SASL PLAIN authentication failed: (reason unavailable), * Jun 17 20:17:53 hosting postfix/submission/smtpd[3585583]: warning: unknown[210.222.43.21]: SASL PLAIN authentication failed: (reason unavailable), * Jun 17 20:20:00 hosting postfix/submission/smtpd[3585914]: warning: unknown[210.222.43.21]: SASL PLAIN authentication failed: (reason unavailable), * show less	Brute-Force
🇷🇴 INTEQ	2026-06-17 18:13:24 (2 days ago)	Brute force attack from 210.222.43.21	Brute-Force
🇩🇪 tentwentyfour	2026-06-17 18:12:37 (2 days ago)	Blocked for probing for SASL accounts (Email)	Brute-Force

Showing 1 to 15 of 235 reports

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