Welcome to the new IP check page! We're rolling it out gradually and would love your input. Spot a bug, or have a suggestion?
Share feedback
51.81.111.3
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.
Log in to view charts and search reports for this IP.
Log In
Top Reporter Countries (Last 60 Days)
Example preview
Report Categories (Last 60 Days)
Example preview
Reports Activity
Example preview
Account required for the enhanced features
Log inSign up
IP Abuse Reports for 51.81.111.3:
This IP address has been reported a total of
93
times from
52 distinct
sources.
51.81.111.3 was first reported on
, and the most recent report was
.
In the last 60 days, the top reporter locations were:
Germany
with 8
reports;
United Kingdom of Great Britain and Northern Ireland
with 1
report;
Ireland
with 1
report.
The most common categories in these recent reports were:
Bad Web Bot
8
times;
Port Scan
3
times;
Exploited Host
1
time;
Brute-Force
1
time;
Web App Attack
1
time;
Other
1
time.
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.
Fail2ban automatic report for plesk-apache-badbot: 51.81.111.3 - - [07/Sep/2026:23:05:26 +0200] GET ...
show moreFail2ban automatic report for plesk-apache-badbot: 51.81.111.3 - - [07/Sep/2026:23:05:26 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 5951 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED]
show less
Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.111.3: traffic from this addr ...
show moreBlocked abusive HTTP application-layer DoS / botnet traffic from 51.81.111.3: 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
(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.3 (US/Unit ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.3 (US/United States/-/-/proxy-us-east006-cip4.ahrefs.net)
show less
(PERMBLOCK) 51.81.111.3 (US/United States/proxy-us-east006-cip4.ahrefs.net) has had more than 2 temp ...
show more(PERMBLOCK) 51.81.111.3 (US/United States/proxy-us-east006-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 51.81.111.3 (US/Unit ...
show more(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.3 (US/United States/proxy-us-east006-cip4.ahrefs.net)
show less
ThreatBook Intelligence: Zombie,Spam more details on https://threatbook.io/ip/51.81.111.3
2025-03-11 ...
show moreThreatBook Intelligence: Zombie,Spam more details on https://threatbook.io/ip/51.81.111.3
2025-03-11 07:37:07 /favicon.ico
2025-03-11 00:04:10 /
show less
