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AbuseIPDB » 51.81.110.52

51.81.110.52 was found in our database!

This IP was reported 4,183 times. Confidence of Abuse is 0%: ?

ISP	OVH US LLC
Usage Type	Data Center/Web Hosting/Transit
ASN	AS16276
Hostname(s)	proxy-us-east004-cip5.ahrefs.net
Domain Name	ovhcloud.com
Country	🇺🇸 United States of America
City	Warrenton, Virginia

IP info including ISP, Usage Type, and Location provided by IPInfo. Updated weekly.

Important Note: 51.81.110.52 is an IP address from within our whitelist belonging to the subnet 51.81.110.48/28, 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.

Report 51.81.110.52

Whois 51.81.110.52

IP Abuse Reports for 51.81.110.52:

This IP address has been reported a total of 4,183 times from 101 distinct sources. 51.81.110.52 was first reported on October 18th 2023, and the most recent report was 1 day ago.

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.

Reporter	IoA Timestamp (UTC)	Comment	Categories
🇨🇿 sajmon0011	2026-09-18 09:46:36 (1 day ago)	51.81.110.52 - - [18/Sep/2026:11:46:36 +0200] "GET /robots.txt HTTP/2.0" 404 196 "-" "Mozilla/5.0 (c ... show more 51.81.110.52 - - [18/Sep/2026:11:46:36 +0200] "GET /robots.txt HTTP/2.0" 404 196 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" ... show less	Web App Attack
🇺🇸 SX Communications	2026-09-17 07:52:39 (2 days ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.110.52: traffic from this add ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.110.52: 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	DDoS Attack Bad Web Bot Exploited Host
🇩🇪 palzer.IT	2026-09-16 17:15:17 (3 days ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [07/Sep/2026:12:03:14 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [07/Sep/2026:12:03:14 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 6037 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇨🇦 Mediashaker	2026-09-15 22:49:35 (3 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.52 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.52 (US/United States/proxy-us-east004-cip5.ahrefs.net) show less	Bad Web Bot
🇨🇦 Mediashaker	2026-09-13 12:50:45 (6 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.52 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.52 (US/United States/proxy-us-east004-cip5.ahrefs.net) show less	Bad Web Bot
🇩🇪 palzer.IT	2026-09-11 04:36:00 (1 week ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [07/Sep/2026:12:03:14 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [07/Sep/2026:12:03:14 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 6037 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇩🇪 HandyTreff.de	2026-09-08 22:38:07 (1 week ago)	Bot/Spam/Scrapper attack detected on www.handytreff.de - Score: -100.165 (Bad < -10 / Very Bad < -20 ... show more Bot/Spam/Scrapper attack detected on www.handytreff.de - Score: -100.165 (Bad < -10 / Very Bad < -20 / Extreme < -35) \| UA: Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/) show less	Web App Attack Bad Web Bot
Anonymous	2026-09-07 10:30:06 (1 week ago)	51.81.110.52 www.rolistore.com - [06/Sep/2026:17:27:20 -0600] "GET /marca-cool-merch/calcetines-spid ... show more 51.81.110.52 www.rolistore.com - [06/Sep/2026:17:27:20 -0600] "GET /marca-cool-merch/calcetines-spiderman-logo HTTP/1.1" 200 739719 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" 51.81.110.52 www.irwindalecycles.com - [07/Sep/2026:03:53:19 -0600] "GET /manufacturer-vittoria HTTP/1.1" 200 284447 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" 51.81.110.52 www.irwindalecycles.com - [07/Sep/2026:04:30:06 -0600] "GET /cat-service HTTP/1.1" 200 333515 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" ... show less	Bad Web Bot
🇩🇪 palzer.IT	2026-09-07 10:03:30 (1 week ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [07/Sep/2026:12:03:14 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [07/Sep/2026:12:03:14 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 6037 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇩🇪 palzer.IT	2026-09-04 04:54:57 (2 weeks ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [04/Sep/2026:06:54:43 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.52 - - [04/Sep/2026:06:54:43 +0200] GET /robots.txt [DOMAIN_REMOVED] 200 5978 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇺🇸 TPI-Abuse	2026-09-01 08:30:46 (2 weeks ago)	(mod_security) mod_security (id:210730) triggered by 51.81.110.52 (proxy-us-east004-cip5.ahrefs.net) ... show more (mod_security) mod_security (id:210730) triggered by 51.81.110.52 (proxy-us-east004-cip5.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Tue Sep 01 04:30:41.417172 2026] [security2:error] [pid 30674:tid 30674] [client 51.81.110.52:58186] ModSecurity: Access denied with code 403 (phase 2). Match of "pmFromFile userdata_wl_extensions" against "TX:extension" required. [file "/etc/apache2/conf.d/modsec_vendor_configs/comodo_apache/10_HTTP_HTTP.conf"] [line "27"] [id "210730"] [rev "5"] [msg "COMODO WAF: URL file extension is restricted by policy\|\|silvermoonherbals.com\|F\|2"] [data ".moongoth.com"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "silvermoonherbals.com"] [uri "/www.moongoth.com"] [unique_id "apaNMUxSblP0iohieWKp1wAAAAU"] show less	Brute-Force Bad Web Bot Web App Attack
🇸🇬 anotherwatcher	2026-08-31 12:36:51 (2 weeks ago)	bad bot	Bad Web Bot
🇩🇪 4server	2026-08-31 08:01:08 (2 weeks ago)	[MonAug3110:01:05.2570292026][security2:error][pid2404163:tid2404225][client51.81.110.52:0]ModSecuri ... show more [MonAug3110:01:05.2570292026][security2:error][pid2404163:tid2404225][client51.81.110.52:0]ModSecurity:Accessdeniedwithcode403\(phase1\).Stringmatch\"/wp-content/plugins/content-manager-light/\"atREQUEST_URI.[file\"/etc/apache2/conf.d/modsec_custom_rules.conf\"][line\"377\"][id\"1101013\"][hostname\"alessandrolucchini.ch\"][uri\"/wp-content/plugins/content-manager-light/include/otw_components/otw_shortcode/css/general_foundicons.css\"][unique_id\"apU0wZd8t_gvScd4WnaCgQAAAFg\"] show less	Port Scan Brute-Force Web App Attack
🇨🇦 Mediashaker	2026-08-30 11:35:59 (2 weeks ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.52 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.52 (US/United States/proxy-us-east004-cip5.ahrefs.net) show less	Bad Web Bot
🇩🇪 ghostwarriors	2026-08-29 22:50:46 (2 weeks ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack

Showing 1 to 15 of 4183 reports

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