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AbuseIPDB » 211.51.216.221

211.51.216.221 was found in our database!

This IP was reported 28 times. Confidence of Abuse is 88%: ?

88%

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

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

Report 211.51.216.221

Whois 211.51.216.221

IP Abuse Reports for 211.51.216.221:

This IP address has been reported a total of 28 times from 19 distinct sources. 211.51.216.221 was first reported on January 3rd 2025, and the most recent report was 9 hours 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
🇺🇦 MakselPr	2026-07-15 10:56:25 (9 hours ago)	Jul 15 11:41:11 mail postfix/smtpd[2646098]: warning: unknown[211.51.216.221]: SASL LOGIN authentica ... show more Jul 15 11:41:11 mail postfix/smtpd[2646098]: warning: unknown[211.51.216.221]: SASL LOGIN authentication failed: (reason unavailable), [email protected] Jul 15 13:56:23 mail postfix/smtpd[2652610]: warning: unknown[211.51.216.221]: SASL LOGIN authentication failed: (reason unavailable), [email protected] ... show less	Brute-Force
🇩🇪 FeG Deutschland	2026-07-15 09:04:05 (10 hours ago)	Mail: - login with unknown user - bruteforce	Brute-Force
Anonymous	2026-07-15 06:52:02 (13 hours ago)	BruteForce IMAP/POP3/SMTP	Brute-Force
Anonymous	2026-07-14 23:07:06 (20 hours ago)	...	Brute-Force
Anonymous	2026-07-14 23:02:30 (20 hours ago)	This IP was detected by CrowdSec triggering local/postfix-sasl-no-ptr-ban	Email Spam Brute-Force
🇮🇹 CoreTech srl	2026-07-14 20:57:33 (23 hours ago)	"SMTP Login failed": count(IP)=15.0Smartermail 22:52:25.831 [175.22.223.25] SMTP Login failed: That ... show more "SMTP Login failed": count(IP)=15.0Smartermail 22:52:25.831 [175.22.223.25] SMTP Login failed: That domain was not found. Double check your email address.Smartermail 22:52:25.831 [175.22.223.25] SMTP Login failed: Domain [midifendo.it] not foundMX1-DC2 22:52:37.925 [155.103.131.36] SMTP Login failed: That domain was not found. Double check your email address.MX1-DC2 22:52:37.925 [155.103.131.36] SMTP Login failed: Domain [gerosagb.it] not foundSmartermail 22:52:42.283 [175.207.208.96] SMTP Login failed: Domain [] not foundSmartermail 22:52:42.283 [175.207.208.96] SMTP Login failed: That domain was not found. Double check your email address.Smartermail 22:53:12.753 [211.51.216.221] SMTP Login failed: That domain was not found. Double check your email address.Smartermail 22:53:12.753 [211.51.216.221] SMTP Login failed: Domain [vittoriale.it] not foundSmartermail 22:53:19.612 [210.204.125.148] SMTP Login failed: Domain [] not found show less	Brute-Force Open Proxy
🇿🇦 maximonline.co.za	2026-07-14 20:46:14 (23 hours ago)	Brute Force SMTP AUTH Attack	Brute-Force
🇮🇹 CoreTech srl	2026-07-14 17:37:33 (1 day ago)	"SMTP Login failed": count(IP)=22.0mail3-dc1 19:33:15.289 [72.179.206.48] SMTP Login failed: Domain ... show more "SMTP Login failed": count(IP)=22.0mail3-dc1 19:33:15.289 [72.179.206.48] SMTP Login failed: Domain [gammadarfo.it] not foundmail3-dc1 19:33:15.289 [72.179.206.48] SMTP Login failed: That domain was not found. Double check your email address.mail3-dc1 19:33:23.992 [46.160.37.175] SMTP Login failed: That domain was not found. Double check your email address.mail3-dc1 19:33:23.992 [46.160.37.175] SMTP Login failed: Domain [] not foundMX1-DC2 19:33:32.297 [197.167.236.181] SMTP Login failed: Domain [graphixltd.co.uk] not foundMX1-DC2 19:33:32.297 [197.167.236.181] SMTP Login failed: That domain was not found. Double check your email address.MX1-DC2 19:34:00.734 [83.34.99.123] SMTP Login failed: Domain [euroimmobiliare.eu] not foundMX1-DC2 19:34:00.734 [83.34.99.123] SMTP Login failed: That domain was not found. Double check your email address.MX1-DC2 19:34:16.223 [211.51.216.221] SMTP Login failed: Domain [] not found show less	Brute-Force
🇬🇧 Hobby Bob	2026-07-14 17:25:27 (1 day ago)	Jul 14 18:25:27 mail postfix/smtps/smtpd[754556]: warning: unknown[211.51.216.221]: SASL LOGIN authe ... show more Jul 14 18:25:27 mail postfix/smtps/smtpd[754556]: warning: unknown[211.51.216.221]: SASL LOGIN authentication failed: UGFzc3dvcmQ6 show less	Hacking Brute-Force
🇮🇹 Progetto1	2026-07-14 14:05:02 (1 day ago)	Mail - Multiple failed login attempts	Brute-Force Exploited Host
🇺🇸 shaunc	2026-07-14 10:32:06 (1 day ago)	Jul 14 05:31:56 mailman postfix/smtpd[15892]: warning: unknown[211.51.216.221]: SASL LOGIN authentic ... show more Jul 14 05:31:56 mailman postfix/smtpd[15892]: warning: unknown[211.51.216.221]: SASL LOGIN authentication failed: authentication failure show less	Brute-Force
Anonymous	2026-07-14 06:37:35 (1 day ago)	7x Postfix SASL LOGIN authentication failed	Brute-Force
🇩🇪 DocNetzwerk	2026-07-14 03:54:53 (1 day ago)	(smtpauth) Failed SMTP AUTH login from 211.51.216.221 (KR/South Korea/-)	Brute-Force
🇩🇪 FeG Deutschland	2026-07-14 02:06:07 (1 day ago)	Mail: - login with unknown user - bruteforce	Brute-Force
🇳🇱 maxxsense	2026-07-14 01:21:46 (1 day ago)	(postfix-unknown) Failed postfix unknown login with username [redacted] from 211.51.216.221 (KR/Sout ... show more (postfix-unknown) Failed postfix unknown login with username [redacted] from 211.51.216.221 (KR/South Korea/-) show less	Hacking

Showing 1 to 15 of 28 reports

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