IP info including ISP, Usage Type, and Location provided
by IPInfo. Updated weekly.
Important Note: 51.81.164.195 is an IP address from within
our whitelist belonging to the subnet
51.81.164.192/28,
which we identify as: "Ahrefs Crawler".
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.
This IP address has been reported a total of
31
times from
16 distinct
sources.
51.81.164.195 was first reported on
, and the most recent report was
.
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.
Auto-flagged by honeypot: tripped /legal/test/config/ — not US+en-US (country: US, accept-language: ...
show moreAuto-flagged by honeypot: tripped /legal/test/config/ — not US+en-US (country: US, accept-language: none)
show less
(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/Un ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/United States/proxy-us-west004-cip4.ahrefs.net)
show less
Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.195: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.195: 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.
show less
Fail2ban automatic report for plesk-apache-badbot: 51.81.164.195 - - [16/Sep/2026:01:32:20 +0200] GE ...
show moreFail2ban automatic report for plesk-apache-badbot: 51.81.164.195 - - [16/Sep/2026:01:32:20 +0200] GET /post-sitemap.xml [DOMAIN_REMOVED] 200 6044 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED]
show less
(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/Un ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/United States/proxy-us-west004-cip4.ahrefs.net)
show less
(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/Un ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/United States/proxy-us-west004-cip4.ahrefs.net)
show less
Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.195: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.195: 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.
show less
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
show less
Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.195: traffic from this ad ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.164.195: 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.
show less
(PERMBLOCK) 51.81.164.195 (US/United States/proxy-us-west004-cip4.ahrefs.net) has had more than 2 te ...
show more(PERMBLOCK) 51.81.164.195 (US/United States/proxy-us-west004-cip4.ahrefs.net) has had more than 2 temp blocks in the last 604800 secs; Ports: *; Direction: inout; Trigger: LF_PERMBLOCK_COUNT; Logs:
show less
(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/Un ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.164.195 (US/United States/proxy-us-west004-cip4.ahrefs.net)
show less
Fail2ban automatic report for plesk-apache-badbot: 51.81.164.195 - - [08/Sep/2026:02:25:11 +0200] GE ...
show moreFail2ban automatic report for plesk-apache-badbot: 51.81.164.195 - - [08/Sep/2026:02:25:11 +0200] GET /robots.txt [DOMAIN_REMOVED] 200 6040 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED]
show less