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51.81.164.158
Neutral Activity
There is no recent abuse activity, or the IP address is whitelisted.
Whitelisted Subnet
Whitelisted netblocks are typically owned by trusted entities, such as Google or Microsoft who
may use them for search engine spiders. However, these same entities sometimes also provide cloud
servers and mail services which are easily abused. Pay special attention when trusting or
distrusting these IPs.
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Top Reporter Countries (Last 60 Days)
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Report Categories (Last 60 Days)
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Reports Activity
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IP Abuse Reports for 51.81.164.158:
This IP address has been reported a total of
22
times from
10 distinct
sources.
51.81.164.158 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 9
reports;
Germany
with 8
reports;
Canada
with 2
reports.
The most common categories in these recent reports were:
Bad Web Bot
17
times;
Exploited Host
8
times;
DDoS Attack
7
times;
Brute-Force
4
times;
Port Scan
3
times;
Other
5
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.
(PERMBLOCK) 51.81.164.158 (US/United States/proxy-us-west003-cip15.ahrefs.net) has had more than 2 t ...
show more(PERMBLOCK) 51.81.164.158 (US/United States/proxy-us-west003-cip15.ahrefs.net) has had more than 2 temp blocks in the last 604800 secs; Ports: *; Direction: inout; Trigger: LF_PERMBLOCK_COUNT; Logs:
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Unauthorized Scraping Attempt - More then 225 Pages Requested in a 24 hour period - Total Requested ...
show moreUnauthorized Scraping Attempt - More then 225 Pages Requested in a 24 hour period - Total Requested Before Block:226
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Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this address continues high-cost dynamic page and feed requests at abusive rates via TCP/HTTPS despite edge block responses. Likely compromised end-user host.
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(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.158 (US/Un ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.158 (US/United States/proxy-us-west003-cip15.ahrefs.net)
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(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.158 (US/Un ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.158 (US/United States/proxy-us-west003-cip15.ahrefs.net)
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Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this address continues high-cost dynamic page and feed requests at abusive rates via TCP/HTTPS despite edge block responses. Likely compromised end-user host.
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Fail2ban automatic report for plesk-apache-badbot: 51.81.164.158 - - [03/Sep/2026:23:10:34 +0200] GE ...
show moreFail2ban automatic report for plesk-apache-badbot: 51.81.164.158 - - [03/Sep/2026:23:10:34 +0200] GET /robots.txt [DOMAIN_REMOVED] 200 6280 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED]
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Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this address continues high-cost dynamic page and feed requests at abusive rates via TCP/HTTPS despite edge block responses. Likely compromised end-user host.
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Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.158: traffic from this address continues high-cost dynamic page and feed requests at abusive rates via TCP/HTTPS despite edge block responses. Likely compromised end-user host.
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