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IP Abuse Reports for 51.81.91.197
This IP address has been reported a total of
15
times from
10 distinct
sources.
51.81.91.197 was first reported on
, and the most recent report was
.
In the last 60 days, the top reporter locations were:
United States of America
with 2
reports;
Austria
with 1
report;
France
with 1
report.
The most common categories in these recent reports were:
Email Spam
4
times;
Spoofing
1
time.
Old Reports
The most recent abuse report for this IP address is from
. It is possible that this IP is no
longer involved in abusive activities.
2026-06-29T01:53:11.515465+02:00 web01.agentur-b-2.de postfix/smtpd[784531]: NOQUEUE: reject: RCPT f ...
show more2026-06-29T01:53:11.515465+02:00 web01.agentur-b-2.de postfix/smtpd[784531]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mta11.gymserver.com>
2026-06-29T01:53:16.685533+02:00 web01.agentur-b-2.de postfix/smtpd[784531]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mta11.gymserver.com>
2026-06-29T01:53:22.365977+02:00 web01.agentur-b-2.de postfix/smtpd[786360]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table; from=<[email protected]> to=<qC
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Fraud VoIP
Brute-Force
Anonymous
2026-06-17T17:56:13.806549+02:00 postfix/smtpd[2569188]: NOQUEUE: reject: RCPT from mta11.gymserver ...
show more2026-06-17T17:56:13.806549+02:00 postfix/smtpd[2569188]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhau
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2026-06-04T03:22:21.438299+02:00 postfix/smtpd[52545]: NOQUEUE: reject: RCPT from mta11.gymserver.c ...
show more2026-06-04T03:22:21.438299+02:00 postfix/smtpd[52545]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhaus.org/query/ip/51.81.91.197; proto=ESMTP helo=<mta11.gymserver.com> 2026-06-04T03:22:21.691526+02:00 postfix/smtpd[52569]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhaus.org/query/ip/51.81.91.197; proto=ESMTP helo=<mta11.gymserver.com> 2026-06-04T03:22:22.829550+02:00 postfix/smtpd[52569]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhaus.org/query/ip/51.81.91.197; proto=ESMTP helo=<mta11.gymserver.com>
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Email Spam
Anonymous
2026-06-04T02:51:52.815106+02:00 postfix/smtpd[369287]: NOQUEUE: reject: RCPT from mta11.gymserver. ...
show more2026-06-04T02:51:52.815106+02:00 postfix/smtpd[369287]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhaus.org/query/ip/51.81.91.197; proto=ESMTP helo=<mta11.gymserver.com> 2026-06-04T02:51:53.959632+02:00 postfix/smtpd[369287]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhaus.org/query/ip/51.81.91.197; proto=ESMTP helo=<mta11.gymserver.com> 2026-06-04T02:51:56.051853+02:00 postfix/smtpd[369287]: NOQUEUE: reject: RCPT from mta11.gymserver.com[51.81.91.197]: 554 5.7.1 Service unavailable; Client host [51.81.91.197] blocked using zen.spamhaus.org; Listed by CSS, see https://check.spamhaus.org/query/ip/51.81.91.197; proto=ESMTP helo=<mta11.gymserver.com>
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(smtp-25-to-rcpt-from-2007-leak) Recipient address has been leaked in 2007 51.81.91.197 (US/United S ...
show more(smtp-25-to-rcpt-from-2007-leak) Recipient address has been leaked in 2007 51.81.91.197 (US/United States/mta11.gymserver.com)
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Hacking
Showing 1 to
15
of 15 reports
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