JavaScript is disabled. Some features of this site may not work properly. For a smoother experience, please enable JavaScript in your browser settings.

AbuseIPDB » 51.81.110.50

51.81.110.50 was found in our database!

This IP was reported 3,404 times. Confidence of Abuse is 0%: ?

ISP	OVH US LLC
Usage Type	Data Center/Web Hosting/Transit
ASN	AS16276
Hostname(s)	proxy-us-east004-cip3.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: 51.81.110.50 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 51.81.110.50

Whois 51.81.110.50

IP Abuse Reports for 51.81.110.50:

This IP address has been reported a total of 3,404 times from 107 distinct sources. 51.81.110.50 was first reported on November 19th 2024, and the most recent report was 12 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
🇬🇷 setupgr	2026-09-11 06:53:40 (12 hours ago)	(mod_security) mod_security (id:11000010) triggered by 51.81.110.50 (US/United States/-/-/-/[AS16276 ... show more (mod_security) mod_security (id:11000010) triggered by 51.81.110.50 (US/United States/-/-/-/[AS16276 OVH SAS]): 1 in the last 86400 secs (CF_ENABLE); Ports: *; Direction: inout; Trigger: LF_MODSEC; Logs: [Fri Sep 11 09:53:39.048322 2026] [security2:error] [pid 29206:tid 65013] [remote 51.81.110.50:31756] 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 "/%CE%BA%CE%BF%CF%85%CE%BA%CE%AD%CF%84%CE%B5%CF%82/%CE%BD%CE%AC%CE%BE%CE%BF%CF%82/"] [unique_id "aqOlc9WdwiMIMGkw95A9xwAExBk"] show less	Port Scan
🇩🇪 palzer.IT	2026-09-11 04:36:00 (15 hours ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.50 - - [08/Sep/2026:17:04:36 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.50 - - [08/Sep/2026:17:04:36 +0200] GET /robots.txt [DOMAIN_REMOVED] 404 5751 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇩🇪 netclix.gr	2026-09-10 22:19:03 (21 hours ago)	(bot_qv) Bot Scraping QuickView 51.81.110.50 (US/United States/proxy-us-east004-cip3.ahrefs.net): 1 ... show more (bot_qv) Bot Scraping QuickView 51.81.110.50 (US/United States/proxy-us-east004-cip3.ahrefs.net): 1 in the last 4600 secs; Ports: *; Direction: inout; Trigger: LF_CUSTOMTRIGGER; Logs: 51.81.110.50 - - [11/Sep/2026:01:19:02 +0300] "GET /index.php?dispatch=products.quick_view&product_id=14491&prev_url=index.php%3Fmatch%3Dall%26pcode_from_q%3DY%26pshort%3DY%26pfull%3DY%26pname%3DY%26pkeywords%3DY%26search_performed%3DY%26q%3DAHAVA%26dispatch%3Dproducts.search%26items_per_page%3D48%26page%3D2&n_items=5937%2C6103%2C6124%2C6841%2C6844%2C6852%2C6853%2C6945%2C6946%2C7065%2C7066%2C7142%2C7143%2C7148%2C7160%2C7222%2C7224%2C7278%2C7638%2C7639%2C7643%2C7644%2C7796%2C8138%2C8263%2C8264%2C9508%2C9509%2C10109%2C10501%2C11693%2C11949%2C11950%2C12961%2C12962%2C12963%2C13072%2C13073%2C13074%2C13075%2C13076%2C13077%2C14168%2C14170%2C14491%2C14492%2C14493%2C14721 HTTP/2.0" 302 0 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" show less	Port Scan
🇺🇸 TPI-Abuse	2026-09-10 08:33:53 (1 day ago)	(mod_security) mod_security (id:210730) triggered by 51.81.110.50 (proxy-us-east004-cip3.ahrefs.net) ... show more (mod_security) mod_security (id:210730) triggered by 51.81.110.50 (proxy-us-east004-cip3.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Thu Sep 10 04:33:49.376957 2026] [security2:error] [pid 18764:tid 18764] [client 51.81.110.50:49712] 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\|\|accordionstars.com\|F\|2"] [data ".accordionfactory.com"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "accordionstars.com"] [uri "/www.accordionfactory.com"] [unique_id "aqJrbWbskqlLO72gEBnFFQAAAAA"] show less	Brute-Force Bad Web Bot Web App Attack
🇫🇷 businessbl	2026-09-09 12:25:47 (2 days ago)	Web request attack. Source IP is in our local ban list (cyberstit.com). Time:2026-09-09 12:25:47 UTC	Bad Web Bot Web App Attack
🇩🇪 palzer.IT	2026-09-08 15:04:52 (3 days ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.50 - - [08/Sep/2026:17:04:36 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.50 - - [08/Sep/2026:17:04:36 +0200] GET /robots.txt [DOMAIN_REMOVED] 404 5751 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇩🇪 ghostwarriors	2026-09-08 07:20:47 (3 days ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack
🇩🇪 Hazzard	2026-09-08 06:25:18 (3 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted]): (CF_ENABLE)	Bad Web Bot
🇩🇪 rh24	2026-09-06 19:04:32 (5 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.50 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.50 (US/United States/proxy-us-east004-cip3.ahrefs.net) show less	Bad Web Bot
🇩🇪 palzer.IT	2026-09-05 22:49:19 (5 days ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.110.50 - - [06/Sep/2026:00:49:05 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.110.50 - - [06/Sep/2026:00:49:05 +0200] GET /page-sitemap.xml [DOMAIN_REMOVED] 200 6387 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇨🇦 Mediashaker	2026-09-05 22:30:56 (5 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.50 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.110.50 (US/United States/proxy-us-east004-cip3.ahrefs.net) show less	Bad Web Bot
Anonymous	2026-09-04 10:02:09 (1 week ago)	Scanner hitting /robots.txt on osef.cloud () — aaguard	Brute-Force Port Scan
🇮🇳 dineshskt4all	2026-09-03 08:33:42 (1 week ago)	51.81.110.50 - - [03/Sep/2026:08:33:40 +0000] "GET /robots.txt HTTP/2.0" 200 193 "-" "Mozilla/5.0 (c ... show more 51.81.110.50 - - [03/Sep/2026:08:33:40 +0000] "GET /robots.txt HTTP/2.0" 200 193 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" ... show less	IoT Targeted
🇺🇸 SX Communications	2026-09-02 04:51:43 (1 week ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.110.50: traffic from this add ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.110.50: 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	2026-08-31 05:20:13 (1 week ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack

Showing 1 to 15 of 3404 reports

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

Recently Reported IPs:

🇫🇷 85.204.70.104

🇺🇸 66.132.224.20

🇵🇭 221.121.96.108

🇺🇦 185.250.21.151

🇦🇷 181.92.24.238

🇯🇵 152.32.201.80

🇺🇸 100.29.192.99

🇪🇸 85.51.46.19

🇺🇸 2602:80d:1008::74

🇦🇷 190.182.160.212

🇲🇽 187.141.172.86

🇵🇪 179.6.137.39

🇺🇸 162.216.150.236

🇵🇰 59.103.119.47

🇰🇷 221.151.84.6

🇳🇱 195.178.110.232

🇦🇿 185.40.34.3

🇮🇩 163.7.9.194

🇺🇸 52.119.100.241

🇷🇺 195.26.81.155