I hope this is the right forum for this question.

What are these web site accesses? Are they some kind of hack probes/attempts? (I changed the last part of the ip address to .0 .) There is no GET or other access type in the record.

69.64.58.0 - - [01/Sep/2014:04:25:23 +0000] "-" 400 0 "-" "-"
50.57.125.0 - - [01/Sep/2014:04:26:05 +0000] "-" 400 0 "-" "-"
50.57.125.0 - - [01/Sep/2014:04:26:47 +0000] "-" 400 0 "-" "-"
69.51.77.0 - - [01/Sep/2014:04:27:55 +0000] "-" 400 0 "-" "-"
62.145.68.0 - - [01/Sep/2014:04:28:12 +0000] "-" 400 0 "-" "-"
31.3.155.0 - - [01/Sep/2014:04:28:33 +0000] "-" 400 0 "-" "-"
103.28.148.0 - - [01/Sep/2014:04:29:20 +0000] "-" 400 0 "-" "-"
91.184.13.0 - - [01/Sep/2014:04:29:38 +0000] "-" 400 0 "-" "-"
62.196.72.0 - - [01/Sep/2014:04:30:01 +0000] "-" 400 0 "-" "-"
1.9.47.0 - - [01/Sep/2014:04:30:53 +0000] "-" 400 0 "-" "-"
112.186.26.0 - - [01/Sep/2014:04:31:03 +0000] "-" 400 0 "-" "-"
194.154.216.0 - - [01/Sep/2014:04:32:53 +0000] "-" 400 0 "-" "-"

Bad Requests:

The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications.[1]

You could let us see some entire entries for the log?
Sanitize your IP but not theirs.

I was thinking about banning such, but I have found since that these same records are found along with legit GET records with the same IP.

Thanks

OK...?