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AbuseIPDB » 51.81.104.45

51.81.104.45 was found in our database!

This IP was reported 13 times. Confidence of Abuse is 0%: ?

ISP	OVH US LLC
Usage Type	Data Center/Web Hosting/Transit
ASN	AS16276
Hostname(s)	proxy-us-east001-cip14.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: 51.81.104.45 is an IP address from within our whitelist belonging to the subnet 51.81.104.32/28, 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 51.81.104.45

Whois 51.81.104.45

IP Abuse Reports for 51.81.104.45:

This IP address has been reported a total of 13 times from 9 distinct sources. 51.81.104.45 was first reported on August 23rd 2026, 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
🇮🇹 CoreTech srl	2026-08-31 14:35:13 (1 day ago)	[DC: IP:151.1.252.27] ntopng alert: blacklisted_server_contact	Hacking
🇺🇸 SX Communications	2026-08-31 02:09:32 (1 day ago)	Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.104.45: traffic from this add ... show more Blocked abusive HTTP application-layer DoS / botnet traffic from 51.81.104.45: 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 23:20:09 (2 days ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack
🇺🇸 TPI-Abuse	2026-08-28 16:18:19 (3 days ago)	(mod_security) mod_security (id:210492) triggered by 51.81.104.45 (proxy-us-east001-cip14.ahrefs.net ... show more (mod_security) mod_security (id:210492) triggered by 51.81.104.45 (proxy-us-east001-cip14.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Fri Aug 28 12:18:10.851242 2026] [security2:error] [pid 11905:tid 11905] [client 51.81.104.45:61048] ModSecurity: Access denied with code 403 (phase 1). Matched phrase ".htaccess" at REQUEST_URI. [file "/etc/apache2/conf.d/modsec_vendor_configs/comodo_apache/02_Global_Generic.conf"] [line "117"] [id "210492"] [rev "3"] [severity "CRITICAL"] [tag "CWAF"] [tag "Generic"] [hostname "nextngnr.com"] [uri "/f7ebIo.htaccess"] [unique_id "apG0wm9eZ7shwdgukIvOPgAAAAk"] show less	Brute-Force Bad Web Bot Web App Attack
🇩🇪 rh24	2026-08-28 12:40:38 (4 days ago)	(apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.104.45 (US/Uni ... show more (apache-useragents) Failed apache-useragents trigger with match [redacted] from 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net) show less	Bad Web Bot
🇺🇸 ChamberofCommerce.com	2026-08-26 04:41:55 (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:226 show less	Bad Web Bot
🇩🇪 netclix.gr	2026-08-26 04:16:53 (6 days ago)	(PERMBLOCK) 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net) has had more than 2 te ... show more (PERMBLOCK) 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net) has had more than 2 temp blocks in the last 604800 secs; Ports: *; Direction: inout; Trigger: LF_PERMBLOCK_COUNT; Logs: show less	Port Scan
🇩🇪 ghostwarriors	2026-08-25 22:20:52 (6 days ago)	Webpage scraping	Brute-Force Bad Web Bot Web App Attack
🇺🇸 TPI-Abuse	2026-08-25 07:35:44 (1 week ago)	(mod_security) mod_security (id:210730) triggered by 51.81.104.45 (proxy-us-east001-cip14.ahrefs.net ... show more (mod_security) mod_security (id:210730) triggered by 51.81.104.45 (proxy-us-east001-cip14.ahrefs.net): 1 in the last 300 secs; Ports: *; Direction: 1; Trigger: LF_MODSEC; Logs: [Tue Aug 25 03:35:36.942264 2026] [security2:error] [pid 31619:tid 31619] [client 51.81.104.45:59016] 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 ".biltmorecabaret.com"] [severity "CRITICAL"] [tag "CWAF"] [tag "HTTP"] [hostname "www.williamfitzsimmons.com"] [uri "/www.biltmorecabaret.com"] [unique_id "ao1FyF4VMkxzyTFo1yA-uQAAAA0"] show less	Brute-Force Bad Web Bot Web App Attack
🇩🇪 netclix.gr	2026-08-24 18:19:26 (1 week ago)	(bot_qv) Bot Scraping QuickView 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net): 1 ... show more (bot_qv) Bot Scraping QuickView 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net): 1 in the last 4600 secs; Ports: *; Direction: inout; Trigger: LF_CUSTOMTRIGGER; Logs: 51.81.104.45 - - [24/Aug/2026:21:19:24 +0300] "GET /index.php?dispatch=products.quick_view&product_id=11307&prev_url=index.php%3Fdispatch%3Dcategories.view%26category_id%3D12%26page%3D3&n_items=11307%2C11305%2C11289%2C12414%2C12596%2C11881%2C11882%2C11974%2C11944%2C11950%2C11951%2C11960%2C11969%2C11978%2C11971%2C11306%2C11326%2C11312%2C11323%2C11300 HTTP/2.0" 302 0 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" show less	Port Scan
Anonymous	2026-08-24 17:37:19 (1 week ago)	Automated web probe/scanner blocked at the edge (WorldTree fleet). Signature: scanner_ua. Example re ... show more Automated web probe/scanner blocked at the edge (WorldTree fleet). Signature: scanner_ua. Example request: /sitemap.xml on apr.ai show less	Bad Web Bot Web App Attack
🇬🇧 Mendip_Defender	2026-08-24 07:00:18 (1 week ago)	51.81.104.45 - - [24/Aug/2026:08:00:27 +0100] "GET /sitemap.xml HTTP/1.1" 200 5626 "-" "Mozilla/5.0 ... show more 51.81.104.45 - - [24/Aug/2026:08:00:27 +0100] "GET /sitemap.xml HTTP/1.1" 200 5626 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" ... show less	Bad Web Bot
🇩🇪 netclix.gr	2026-08-23 16:06:44 (1 week ago)	(bot_qv) Bot Scraping QuickView 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net): 1 ... show more (bot_qv) Bot Scraping QuickView 51.81.104.45 (US/United States/proxy-us-east001-cip14.ahrefs.net): 1 in the last 4600 secs; Ports: *; Direction: inout; Trigger: LF_CUSTOMTRIGGER; Logs: 51.81.104.45 - - [23/Aug/2026:19:06:41 +0300] "GET /index.php?dispatch=products.quick_view&product_id=11037&prev_url=index.php%3Fsl%3Den%26dispatch%3Dcategories.view%26category_id%3D1%26page%3D21&n_items=11983%2C11746%2C11807%2C11786%2C11887%2C10915%2C11037%2C11401%2C11403%2C11414%2C11108%2C11090%2C11878%2C12440%2C12619%2C12371%2C12362%2C12428%2C10891%2C11824 HTTP/2.0" 302 0 "-" "Mozilla/5.0 (compatible; AhrefsBot/7.0; +http://ahrefs.com/robot/)" show less	Port Scan

Showing 1 to 13 of 13 reports

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