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172.104.166.177

Recent Activity

Abuse confidence score ?

77% Critical

15 reports

15 reporters · latest 2 days ago

ISP	Linode
Usage Type	Data Center/Web Hosting/Transit
ASN	AS63949
Domain Name	linode.com
Country	🇸🇬 Singapore
City	Singapore

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IP Abuse Reports for 172.104.166.177

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This IP address has been reported a total of 15 times from 15 distinct sources. 172.104.166.177 was first reported on November 22nd 2021, and the most recent report was 2 days ago. In the last 60 days, the top reporter locations were: Netherlands with 3 reports; Australia with 1 report; Brazil with 1 report. The most common categories in these recent reports were: Brute-Force 13 times; Email Spam 1 time; Web App Attack 1 time.

Reporter	IoA Timestamp (UTC)	Comment	Categories
🇬🇧 openstrike.co.uk	2026-10-08 08:09:22 (2 days ago)	26 packets to ports 143 993	Brute-Force
🇺🇦 space.ua	2026-10-07 10:37:01 (2 days ago)	MAIL_Brute-Force	Brute-Force
Anonymous	2026-10-07 08:00:06 (3 days ago)	fail2ban: brute-force/credential spraying against mail (IMAP/POP/webmail) — rmnet.it	Brute-Force
Anonymous	2026-10-07 07:36:29 (3 days ago)	(imapd) Failed IMAP login from 172.104.166.177 (SG/Singapore/172-104-166-177.ip.linodeusercontent.co ... show more (imapd) Failed IMAP login from 172.104.166.177 (SG/Singapore/172-104-166-177.ip.linodeusercontent.com) show less	Brute-Force
🇿🇦 maximonline.co.za	2026-10-07 04:22:03 (3 days ago)	Brute Force IMAP AUTH Attack	Brute-Force
Anonymous	2026-10-07 04:04:09 (3 days ago)	7x Dovecot auth failed (on 3 different adresses)	Brute-Force
Anonymous	2026-10-07 02:56:05 (3 days ago)	BruteForce IMAP/POP3/SMTP	Brute-Force
🇫🇮 notelseit	2026-10-07 02:55:15 (3 days ago)	2026-10-07T04:54:53.225028+02:00 mail dovecot: imap-login: Disconnected: Connection closed (no auth ... show more 2026-10-07T04:54:53.225028+02:00 mail dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 1 secs): user=<>, rip=172.104.166.177, lip=65.21.131.50, TLS: Connection closed, session=<YMZLPTddruesaKax> 2026-10-07T04:54:54.395297+02:00 mail dovecot: auth-worker(1173312): conn unix:auth-worker (pid=852160,uid=110): auth-worker<3088>: sql([email protected],172.104.166.177,<j59dPTddeqasaKax>): Password mismatch 2026-10-07T04:54:56.607066+02:00 mail dovecot: imap-login: Disconnected: Connection closed (auth failed, 1 attempts in 2 secs): user=<[email protected]>, method=PLAIN, rip=172.104.166.177, lip=65.21.131.50, TLS: Connection closed, session=<j59dPTddeqasaKax> 2026-10-07T04:55:12.434943+02:00 mail dovecot: auth-worker(1173312): conn unix:auth-worker (pid=852160,uid=110): auth-worker<3093>: sql([email protected],172.104.166.177,<bOJwPjddSM6saKax>): Password mismatch 2026-10-07T04:55:14.637658+02:00 mail dovecot: imap-login: Disconnected: Connection closed (auth fail ... show less	Brute-Force Email Spam
🇦🇺 AWW-Admin	2026-10-07 02:44:19 (3 days ago)	(imapd) Failed IMAP login from 172.104.166.177 (SG/Singapore/172-104-166-177.ip.linodeusercontent.co ... show more (imapd) Failed IMAP login from 172.104.166.177 (SG/Singapore/172-104-166-177.ip.linodeusercontent.com) show less	Brute-Force
🇷🇴 clauss	2026-10-07 02:42:18 (3 days ago)	IP reached maximum auth failures for a one day block	Brute-Force
Anonymous	2026-10-07 01:03:30 (3 days ago)	Authentication failure	Brute-Force
🇮🇩 aaKenshin	2026-10-06 21:12:03 (3 days ago)	Suspicious activity detected from IP 172.104.166.177 based on mailserver logs. Sample logs: 2026-10- ... show more Suspicious activity detected from IP 172.104.166.177 based on mailserver logs. Sample logs: 2026-10-07 05:11:41,741 INFO [ImapServer-29064] [ip=172.16.0.182;oip=172.104.166.177;via=172.16.0.182(nginx/1.24.0);ua=Zimbra/24.9.7_ZEXTRAS_202410;cid=31722;] imap - LOGIN elapsed=2 (NIO) 2026-10-07 05:11:52,500 INFO [ImapServer-29060] [ip=172.16.0.182;cid=31723;oip=172.104.166.177;via=172.16.0.182(nginx/1.24.0);ua=Zimbra/24.9.7_ZEXTRAS_202410;] imap - ID elapsed=0 (NIO) 2026-10-07 05:11:52,503 INFO [ImapServer-29064] [ip=172.16.0.182;oip=172.104.166.177;via=172.16.0.182(nginx/1.24.0);ua=Zimbra/24.9.7_ZEXTRAS_202410;cid=31723;] imap - authentication failed for [] (LDAP error: - unable to ldap authenticate: invalid credentials) 2026-10-07 05:11:52,503 INFO [ImapServer-29064] [ip=172.16.0.182;oip=172.104.166.177;via=172.16.0.182(nginx/1.24.0);ua=Zimbra/24.9.7_ZEXTRAS_202410;cid=31723;] account - Error occurred during authentication: authentication failed for []. Reason: LDAP error: - un show less	Brute-Force
🇳🇱 wlt-blocker	2026-10-06 19:32:05 (3 days ago)	Attempts to login to mail server with wrong username and/or password	Brute-Force
🇳🇱 Mangelot Hosting	2026-10-06 13:21:16 (3 days ago)	(dovecot_invalid_user) srv103 Dovecot login on non-existent account 172.104.166.177 (SG/Singapore/17 ... show more (dovecot_invalid_user) srv103 Dovecot login on non-existent account 172.104.166.177 (SG/Singapore/172-104-166-177.ip.linodeusercontent.com): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_CUSTOMTRIGGER; Logs: Oct 6 15:21:08 dovecot[2018792]: imap-login: Login aborted: Connection closed (auth failed, 1 attempts in 2 secs) (auth_failed): user=[USERNAME] method=PLAIN, rip=172.104.166.177, lip=0.0.0.x, TLS: Connection closed, session=<VeL13itd6NqsaKax> show less	Web App Attack
🇿🇦 IrisFlower	2021-11-22 12:31:55 (4 years ago)	Unauthorized connection attempt detected from IP address 172.104.166.177 to port 8888 [J]	Port Scan Hacking

Showing 1 to 15 of 15 reports

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