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AbuseIPDB » 51.81.105.24

51.81.105.24 was found in our database!

This IP was reported 15 times. Confidence of Abuse is 0%: ?

ISP	OVH US LLC
Usage Type	Data Center/Web Hosting/Transit
ASN	AS16276
Hostname(s)	proxy-us-east002-cip9.ahrefs.net
Domain Name	ovhcloud.com
Country	🇺🇸 United States of America
City	Reston, Virginia

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

Important Note: 51.81.105.24 is an IP address from within our whitelist belonging to the subnet 51.81.105.16/28, 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 51.81.105.24

Whois 51.81.105.24

IP Abuse Reports for 51.81.105.24:

This IP address has been reported a total of 15 times from 12 distinct sources. 51.81.105.24 was first reported on August 23rd 2026, and the most recent report was 17 hours 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
🇺🇸 TPI-Abuse	2026-09-01 08:20:15 (17 hours ago)	(mod_security) mod_security (id:210730) triggered by 51.81.105.24 (proxy-us-east002-cip9.ahrefs.net) ... show more (mod_security) mod_security (id:210730) triggered by 51.81.105.24 (proxy-us-east002-cip9.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Tue Sep 01 04:20:08.601535 2026] [security2:error] [pid 31606:tid 31606] [client 51.81.105.24:61092] 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\|\|www.williamfitzsimmons.com\|F\|2"] [data ".rex.greyareaprod.com"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "www.williamfitzsimmons.com"] [uri "/www.rex.greyareaprod.com"] [unique_id "apaKuFOQh9lJQ5QNwf13hAAAABA"] show less	Brute-Force Bad Web Bot Web App Attack
🇺🇸 TPI-Abuse	2026-09-01 03:09:57 (23 hours ago)	(mod_security) mod_security (id:210730) triggered by 51.81.105.24 (proxy-us-east002-cip9.ahrefs.net) ... show more (mod_security) mod_security (id:210730) triggered by 51.81.105.24 (proxy-us-east002-cip9.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Mon Aug 31 23:09:50.221094 2026] [security2:error] [pid 18216:tid 18216] [client 51.81.105.24:28712] 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\|\|www.kingstoneproperties.com\|F\|2"] [data ".com"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "www.kingstoneproperties.com"] [uri "/[email protected]"] [unique_id "apZB_kXe7OtwNx1qlrNxaAAAAAM"] show less	Brute-Force Bad Web Bot Web App Attack
🇩🇪 4server	2026-08-31 08:01:23 (1 day ago)	[MonAug3110:01:19.2302822026][security2:error][pid2404165:tid2404235][client51.81.105.24:0]ModSecuri ... show more [MonAug3110:01:19.2302822026][security2:error][pid2404165:tid2404235][client51.81.105.24:0]ModSecurity:Accessdeniedwithcode403\(phase1\).Stringmatch\"/wp-content/plugins/blog-manager-light/\"atREQUEST_URI.[file\"/etc/apache2/conf.d/modsec_custom_rules.conf\"][line\"367\"][id\"1101011\"][hostname\"alessandrolucchini.ch\"][uri\"/wp-content/plugins/blog-manager-light/frontend/js/script.js\"][unique_id\"apU0z1TIkNGAV_E4WNmHawAAAIE\"] show less	Port Scan Brute-Force Web App Attack
🇺🇸 SX Communications	2026-08-30 19:19:45 (2 days ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.105.24: traffic from this add ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.105.24: 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
🇩🇪 ghostwarriors	2026-08-29 22:50:28 (3 days ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack
🇧🇷 Sipo Chutão	2026-08-29 03:00:01 (3 days ago)	ModSecurity: Access denied with code 403 (phase 1). Matched phrase AhrefsBot"	Hacking
🇫🇷 MatStef132	2026-08-28 10:09:43 (4 days ago)	MatShield L7: blocked on wiki.mathost.eu (suspicious behaviour)	DDoS Attack
🇩🇪 ghostwarriors	2026-08-28 07:20:28 (4 days ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack
🇬🇷 setupgr	2026-08-26 05:13:28 (6 days ago)	(mod_security) mod_security (id:11000010) triggered by 51.81.105.24 (US/United States/Florida/Tampa ... show more (mod_security) mod_security (id:11000010) triggered by 51.81.105.24 (US/United States/Florida/Tampa (Bayside West)/-/[AS16276 OVH]): 1 in the last 86400 secs (CF_ENABLE); Ports: *; Direction: inout; Trigger: LF_MODSEC; Logs: [Wed Aug 26 08:13:27.367299 2026] [security2:error] [pid 1783173:tid 1783258] [remote 51.81.105.24:46972] ModSecurity: Access denied with code 403 (phase 1). Matched phrase "AhrefsBot" at REQUEST_HEADERS:User-Agent. [file "/etc/apache2/conf.d/modsec/modsec2.user.conf"] [line "114"] [id "11000010"] [msg "BLOCKED BOT: AhrefsBot on ftiaxtomonosou.gr"] [severity "ALERT"] [hostname "ftiaxtomonosou.gr"] [uri "/robots.txt"] [unique_id "ao519_GDNaMwtUOPNwifsAAB0BQ"] show less	Port Scan
🇺🇸 ChamberofCommerce.com	2026-08-26 04:33:23 (6 days ago)	Unauthorized Scraping Attempt - More then 225 Pages Requested in a 24 hour period - Total Requested ... show more Unauthorized Scraping Attempt - More then 225 Pages Requested in a 24 hour period - Total Requested Before Block:227 show less	Bad Web Bot
🇨🇦 Mediashaker	2026-08-25 13:40:46 (1 week ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.105.24 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.105.24 (US/United States/proxy-us-east002-cip9.ahrefs.net) show less	Bad Web Bot
Anonymous	2026-08-24 06:07:31 (1 week ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.105.24 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.105.24 (US/United States/proxy-us-east002-cip9.ahrefs.net) show less	Bad Web Bot
🇺🇸 SX Communications	2026-08-23 16:18:22 (1 week ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.105.24: traffic from this add ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.105.24: 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
🇩🇪 netclix.gr	2026-08-23 15:37:50 (1 week ago)	(bot_qv) Bot Scraping QuickView 51.81.105.24 (US/United States/proxy-us-east002-cip9.ahrefs.net): 1 ... show more (bot_qv) Bot Scraping QuickView 51.81.105.24 (US/United States/proxy-us-east002-cip9.ahrefs.net): 1 in the last 4600 secs; Ports: *; Direction: inout; Trigger: LF_CUSTOMTRIGGER; Logs: 51.81.105.24 - - [23/Aug/2026:18:37:48 +0300] "GET /index.php?dispatch=products.quick_view&product_id=12963&prev_url=index.php%3Fdispatch%3Dcategories.view%26category_id%3D53&n_items=11758%2C11839%2C12755%2C12963%2C10886%2C11700%2C10750%2C13057%2C13067%2C10873%2C10878%2C11701%2C11757%2C11697%2C11699%2C11698%2C11784%2C12608%2C11702%2C11704 HTTP/2.0" 302 0 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" show less	Port Scan
🇪🇸 elcruzado.es	2026-08-23 12:27:51 (1 week ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.105.24 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.105.24 (US/United States/proxy-us-east002-cip9.ahrefs.net) show less	Bad Web Bot

Showing 1 to 15 of 15 reports

Think this IP has been falsely reported? You may request to have the associated reports reviewed and removed. Request Takedown 🚩

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