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AbuseIPDB » 51.81.163.72

51.81.163.72 was found in our database!

This IP was reported 54 times. Confidence of Abuse is 0%: ?

ISP	OVH US LLC
Usage Type	Data Center/Web Hosting/Transit
ASN	AS16276
Hostname(s)	proxy-us-west002-cip9.ahrefs.net
Domain Name	ovhcloud.com
Country	🇺🇸 United States of America
City	Hillsboro, Oregon

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

Important Note: 51.81.163.72 is an IP address from within our whitelist belonging to the subnet 51.81.163.64/28, 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 51.81.163.72

Whois 51.81.163.72

IP Abuse Reports for 51.81.163.72:

This IP address has been reported a total of 54 times from 20 distinct sources. 51.81.163.72 was first reported on August 23rd 2026, and the most recent report was 7 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
🇩🇪 Hazzard	2026-10-22 12:08:19 (7 hours ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted]): (CF_ENABLE)	Bad Web Bot
Anonymous	2026-10-22 11:57:30 (8 hours ago)	apache vulnerability scan	Web App Attack
🇩🇪 palzer.IT	2026-10-22 04:48:51 (15 hours ago)	Report for plesk-apache-badbot: 51.81.163.72 - - [10/Oct/2026:19:44:55 +0200] GET /post-sitemap.xml ... show more Report for plesk-apache-badbot: 51.81.163.72 - - [10/Oct/2026:19:44:55 +0200] GET /post-sitemap.xml [DOMAIN_REMOVED] 200 6340 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇨🇦 Mediashaker	2026-10-21 07:52:36 (1 day ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.163.72 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.163.72 (US/United States/proxy-us-west002-cip9.ahrefs.net) show less	Bad Web Bot
🇺🇸 SX Communications	2026-10-20 14:31:21 (2 days ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.163.72: traffic from this add ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.163.72: 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
🇧🇷 ICS Labs	2026-10-17 04:05:12 (5 days ago)	ICS Labs threat intelligence (ICS Feeds): Brute-Force. Last observed 2026-10-17 UTC.	Brute-Force
🇨🇦 Mediashaker	2026-10-17 03:52:10 (5 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.163.72 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.163.72 (US/United States/proxy-us-west002-cip9.ahrefs.net) show less	Bad Web Bot
🇩🇪 ghostwarriors	2026-10-16 22:50:15 (5 days ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack
🇮🇩 hermawan	2026-10-16 09:49:24 (6 days ago)	[Fri Oct 16 16:49:23.914513 2026] [security2:error] [pid 175043:tid 140319752320704] [client 51.81.1 ... show more [Fri Oct 16 16:49:23.914513 2026] [security2:error] [pid 175043:tid 140319752320704] [client 51.81.163.72:0] ModSecurity: Access denied with code 403 (phase 1). Matched phrase "AhrefsBot" at REQUEST_HEADERS:user-agent. [file "/etc/modsecurity/coreruleset-4.29.0/rules/REQUEST-913-SCANNER-DETECTION.conf"] [line "166"] [id "913102"] [msg "Found User-Agent associated with web crawler/bot"] [data " Matched Data ARGS charset: - Matched Data TX.1: found within Content-Type multipart form Matched Data: AhrefsBot found within REQUEST_HEADERS:user-agent: mozilla/5.0 (compatible; ahrefsbot/7.0; +http://ahrefs.com/robot/) request_line = GET /index.php/analisis-bulanan/4053-tingkat-ketersediaan-air-tanah/tingkat-ketersediaan-air-tanah-di-provinsi-jawa-timur/analisis-bulanan-tingkat-ketersediaan-air-tanah-di-provinsi-jawa-timur-tahun-2020/555558107-analisis-bulanan-tingkat-ketersediaan-air-tanah-bulan-me..."] [severity "CRITICAL"] [ver "OWASP_CRS/3.3.5"] [tag "application-multi"] [tag "language-mu ... show less	Email Spam Hacking
🇩🇪 palzer.IT	2026-10-15 04:46:07 (1 week ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.163.72 - - [10/Oct/2026:19:44:55 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.163.72 - - [10/Oct/2026:19:44:55 +0200] GET /post-sitemap.xml [DOMAIN_REMOVED] 200 6340 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇮🇩 hermawan	2026-10-15 02:16:16 (1 week ago)	[Thu Oct 15 09:16:16.280310 2026] [security2:error] [pid 28099:tid 139627415455424] [client 51.81.16 ... show more [Thu Oct 15 09:16:16.280310 2026] [security2:error] [pid 28099:tid 139627415455424] [client 51.81.163.72:0] ModSecurity: Access denied with code 403 (phase 1). Matched phrase "AhrefsBot" at REQUEST_HEADERS:user-agent. [file "/etc/modsecurity/coreruleset-4.29.0/rules/REQUEST-913-SCANNER-DETECTION.conf"] [line "166"] [id "913102"] [msg "Found User-Agent associated with web crawler/bot"] [data " Matched Data ARGS charset: - Matched Data TX.1: found within Content-Type multipart form Matched Data: AhrefsBot found within REQUEST_HEADERS:user-agent: mozilla/5.0 (compatible; ahrefsbot/7.0; +http://ahrefs.com/robot/) request_line = GET /index.php/profil/meteorologi/list-all-categories/4018-klimatologi/analisis-klimatologi/analisis-dasarian/distribusi-curah-hujan-dasarian-propinsi-jawa-timur/analisis-dasarian-distribusi-curah-hujan-tahun-2020-di-propinsi-jawa-timur/555558093-analisis-dasarian-distr..."] [severity "CRITICAL"] [ver "OWASP_CRS/3.3.5"] [tag "application-multi"] [tag "language-mul ... show less	Email Spam Hacking
Anonymous	2026-10-12 06:45:22 (1 week ago)	51.81.163.72 www.rolistore.com - [12/Oct/2026:00:26:46 -0600] "GET /audifonos-jbl-tune-530c-negro HT ... show more 51.81.163.72 www.rolistore.com - [12/Oct/2026:00:26:46 -0600] "GET /audifonos-jbl-tune-530c-negro HTTP/1.1" 200 719447 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)"\n51.81.163.72 www.rolistore.com - [12/Oct/2026:00:40:14 -0600] "GET /audifonos-jbl-quantum-250-verde HTTP/1.1" 200 715489 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)"\n51.81.163.72 www.rolistore.com - [12/Oct/2026:00:45:21 -0600] "GET /image/cache/catalog/productos/JBL/JBLQTUM250BLKAM/JBLQTUM250BLKAM_03-550x550.jpg HTTP/1.1" 200 16343 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" show less	Bad Web Bot
🇨🇦 Mediashaker	2026-10-11 09:39:51 (1 week ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.163.72 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.163.72 (US/United States/proxy-us-west002-cip9.ahrefs.net) show less	Bad Web Bot
🇩🇪 palzer.IT	2026-10-10 17:45:29 (1 week ago)	Fail2ban automatic report for plesk-apache-badbot: 51.81.163.72 - - [10/Oct/2026:19:44:55 +0200] GET ... show more Fail2ban automatic report for plesk-apache-badbot: 51.81.163.72 - - [10/Oct/2026:19:44:55 +0200] GET /post-sitemap.xml [DOMAIN_REMOVED] 200 6340 - Mozilla/5.0 (compatible; AhrefsBot/7.0; +[DOMAIN_REMOVED] show less	Bad Web Bot
🇺🇸 johnkarlhill	2026-10-10 13:02:41 (1 week ago)	WebKnight blocked malicious web request on johnkarlhill.com	Brute-Force SSH

Showing 1 to 15 of 54 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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