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The last "column" in my Apache server logs lists either a pair of IPs, one single IP, or is empty (i.e. "-"). Sometimes the first in a pair of IPs is "unknown". It looks something like this:

"unknown, 141.91.240.141"
"172.26.243.42"
"-"
"10.14.2.6, 10.14.2.65"

What is that?

I'm on a shared server and cannot access the config file.

1 Answer 1

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Such IPs are usually the content of the X-Forwarded-For header. That header is added by http proxies like squid in order to tell the server what client the request is made for. If the request goes through several proxies they will add the IPs in a list.

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