Weird result from $_SERVER['REMOTE_ADDR']

Question

To log IP addresses of people visiting my web site I used $_SERVER['REMOTE_ADDR'].

192.168.111.111  18.04.2014 23:25:23 <- My local computer
54.72.x.x  19.04.2014 10:05:53 <- Actual remote visitor, so this is working
84.251.x.x  19.04.2014 12:41:38 <- ?

84.251.x.x is public address of my router. I cannot understand why that IP would have visited my website.

So why would $_SERVER['REMOTE_ADDR'] log this address? Documentation says it should show IP of user viewing page and as far as I understand router would not do such a thing.

My network consist of computer, web server (Raspberry Pi) and ZyXEL P-660HN-T1A router.

EDIT: I didn't do anything at 12:41 so that visit was not caused by me.

EDIT2: First I though this might have been problem with PHP $_SERVER['REMOTE_ADDR'] but I just managed to capture same event with Wireshark. It also shows HTTP query coming from 84.251.x.x. I just can't understand why this happens.

Answer 1

After investigating I finally found solution from packets captured by Wireshark:User-Agent: Mozilla/5.0 (ABE, http://noscript.net/abe/wan)

NoScript feature called ABE uses public address of routers.

http://noscript.net/abe/wan