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IP Abuse Reports for 91.231.121.99:
This IP address has been reported a total of
255
times from
88 distinct
sources.
91.231.121.99 was first reported on
, and the most recent report was
.
In the last 60 days, the top reporter locations were:
Germany
with 14
reports;
United States of America
with 5
reports;
France
with 4
reports.
The most common categories in these recent reports were:
Brute-Force
36
times;
Hacking
8
times;
Email Spam
7
times;
Port Scan
7
times;
Web App Attack
4
times.
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.
Automated report from fail2ban on mail.fitzgerald.eu. Jail: dovecot. First seen: 2026-09-03 15:30:11 ...
show moreAutomated report from fail2ban on mail.fitzgerald.eu. Jail: dovecot. First seen: 2026-09-03 15:30:11. Events: 1. Reported by ipdb-security/fitzgerald.eu
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(imapd) Failed IMAP login from 91.231.121.99 (PL/Poland/Lublin/Zamość/-/[AS198072 GTnet Sp. z o.o.]) ...
show more(imapd) Failed IMAP login from 91.231.121.99 (PL/Poland/Lublin/Zamość/-/[AS198072 GTnet Sp. z o.o.]): 2 in the last 3600 secs
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[28/Aug/2026 16:54:30] IMAP: Authentication failed for user [email protected]. Attempt from IP a ...
show more[28/Aug/2026 16:54:30] IMAP: Authentication failed for user [email protected]. Attempt from IP address 91.231.121.99. External authentication service rejected authentication due to invalid password or authentication restriction.
[28/Aug/2026 16:54:38] IMAP: Authentication failed for user [email protected]. Attempt from IP address 91.231.121.99. External authentication service rejected authentication due to invalid password or authentication restriction.
[28/Aug/2026 16:54:45] IMAP: Authentication failed for user [email protected]. Attempt from IP address 91.231.121.99. External authentication service rejected authentication due to invalid password or authentication restriction.
...
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[26/Aug/2026 10:16:36] IMAP: Authentication failed for user [email protected]. Attempt from IP ...
show more[26/Aug/2026 10:16:36] IMAP: Authentication failed for user [email protected]. Attempt from IP address 91.231.121.99. External authentication service rejected authentication due to invalid password or authentication restriction.
[26/Aug/2026 10:16:44] IMAP: Authentication failed for user [email protected]. Attempt from IP address 91.231.121.99. External authentication service rejected authentication due to invalid password or authentication restriction.
[26/Aug/2026 10:16:51] IMAP: Authentication failed for user [email protected]. Attempt from IP address 91.231.121.99. External authentication service rejected authentication due to invalid password or authentication restriction.
...
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Zimbra: Login failures from malicious IP: 91.231.121.99. Threat Score: 6/10 (MEDIUM). Reported by Ta ...
show moreZimbra: Login failures from malicious IP: 91.231.121.99. Threat Score: 6/10 (MEDIUM). Reported by TangerangKota-CSIRT
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