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AbuseIPDB » 51.81.111.138

51.81.111.138 was found in our database!

This IP was reported 25 times. Confidence of Abuse is 0%: ?

ISP	OVH US LLC
Usage Type	Data Center/Web Hosting/Transit
ASN	AS16276
Hostname(s)	proxy-us-east009-cip11.ahrefs.net
Domain Name	ovhcloud.com
Country	🇺🇸 United States of America
City	Leesburg, Virginia

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

Important Note: 51.81.111.138 is an IP address from within our whitelist belonging to the subnet 51.81.111.128/28, 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 51.81.111.138

Whois 51.81.111.138

IP Abuse Reports for 51.81.111.138:

This IP address has been reported a total of 25 times from 14 distinct sources. 51.81.111.138 was first reported on August 23rd 2026, and the most recent report was 8 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
Anonymous	2026-09-17 07:14:32 (8 hours ago)	Banned by Fail2Ban on server	Web App Attack
🇮🇪 Jim Keir	2026-09-17 02:38:59 (13 hours ago)	2026-09-17 02:38:57 51.81.111.138 Bad bot, blocking Mozilla/5.0	Bad Web Bot
🇩🇪 palzer.IT	2026-09-16 17:15:30 (22 hours ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.111.138 - - [08/Sep/2026:11:48:48 +0200] GE ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.111.138 - - [08/Sep/2026:11:48:48 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 5951 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇺🇸 SX Communications	2026-09-15 23:23:31 (1 day ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.111.138: traffic from this ad ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.111.138: 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
🇺🇸 TPI-Abuse	2026-09-14 16:39:49 (2 days ago)	(mod_security) mod_security (id:210730) triggered by 51.81.111.138 (proxy-us-east009-cip11.ahrefs.ne ... show more (mod_security) mod_security (id:210730) triggered by 51.81.111.138 (proxy-us-east009-cip11.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Mon Sep 14 12:39:43.561081 2026] [security2:error] [pid 31439:tid 31439] [client 51.81.111.138:21268] 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.nationalnova.com\|F\|2"] [data ".db"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "www.nationalnova.com"] [uri "/images/audio/Thumbs.db"] [unique_id "aqgjTxiFCDTLOCpjQonOlwAAAAw"] show less	Brute-Force Bad Web Bot Web App Attack
🇨🇦 Mediashaker	2026-09-14 16:17:56 (2 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.138 (US/Un ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.138 (US/United States/proxy-us-east009-cip11.ahrefs.net) show less	Bad Web Bot
🇨🇦 Mediashaker	2026-09-12 00:37:32 (5 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.138 (US/Un ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.111.138 (US/United States/proxy-us-east009-cip11.ahrefs.net) show less	Bad Web Bot
🇩🇪 palzer.IT	2026-09-11 04:36:09 (6 days ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.111.138 - - [08/Sep/2026:11:48:48 +0200] GE ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.111.138 - - [08/Sep/2026:11:48:48 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 5951 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇺🇸 TPI-Abuse	2026-09-11 02:29:40 (6 days ago)	(mod_security) mod_security (id:210730) triggered by 51.81.111.138 (proxy-us-east009-cip11.ahrefs.ne ... show more (mod_security) mod_security (id:210730) triggered by 51.81.111.138 (proxy-us-east009-cip11.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Thu Sep 10 22:29:36.870842 2026] [security2:error] [pid 4742:tid 4742] [client 51.81.111.138:56986] 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.danharrisphotoart.com\|F\|2"] [data ".dpreview.com"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "www.danharrisphotoart.com"] [uri "/www.dpreview.com"] [unique_id "aqNnkCD4RGZ0fVXj9AhKwAAAAAs"] show less	Brute-Force Bad Web Bot Web App Attack
🇩🇪 netclix.gr	2026-09-10 22:16:27 (6 days ago)	(bot_qv) Bot Scraping QuickView 51.81.111.138 (US/United States/proxy-us-east009-cip11.ahrefs.net): ... show more (bot_qv) Bot Scraping QuickView 51.81.111.138 (US/United States/proxy-us-east009-cip11.ahrefs.net): 1 in the last 4600 secs; Ports: *; Direction: inout; Trigger: LF_CUSTOMTRIGGER; Logs: 51.81.111.138 - - [11/Sep/2026:01:16:25 +0300] "GET /index.php?dispatch=products.quick_view&product_id=6852&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
🇮🇹 CoreTech srl	2026-09-09 15:20:10 (1 week ago)	[DC: IP:151.1.252.27] ntopng alert: blacklisted_server_contact	Hacking
🇺🇸 etu brutus	2026-09-09 12:16:16 (1 week ago)	51.81.111.138 Blocked by [Attack Vector List] ...	Hacking Brute-Force Exploited Host
🇩🇪 palzer.IT	2026-09-08 09:49:06 (1 week ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.111.138 - - [08/Sep/2026:11:48:48 +0200] GE ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.111.138 - - [08/Sep/2026:11:48:48 +0200] GET /sitemap_index.xml [DOMAIN_REMOVED] 200 5951 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇩🇪 Hazzard	2026-09-08 04:02:12 (1 week ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted]): (CF_ENABLE)	Bad Web Bot
🇩🇪 ghostwarriors	2026-09-08 00:50:22 (1 week ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack

Showing 1 to 15 of 25 reports

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