Weird error_log entries

#1
Anybody familiar with what these are

2010-01-26 09:04:00.002 [NOTICE] [75.126.76.246:48363-2#APVH_domain.com] Content len: 287, Request line:
POST /search.php HTTP/1.1
2010-01-26 09:04:43.700 [NOTICE] [75.126.76.246:63420-1#APVH_domain.com] Content len: 283, Request line:
POST /search.php HTTP/1.1
2010-01-26 09:08:08.601 [NOTICE] [75.126.76.246:43268-1#APVH_domain.com] Content len: 282, Request line:
POST /search.php HTTP/1.1
2010-01-26 09:08:23.706 [NOTICE] [75.126.76.246:48129-0#APVH_domain.com] Content len: 54, Request line:
POST /search.php HTTP/1.1
2010-01-26 09:09:26.402 [NOTICE] [75.126.76.246:23133-1#APVH_domain.com] Content len: 284, Request line:
POST /search.php HTTP/1.1
 
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