Where can i monitor my server IP or whole IP subnet against various IP blacklists? I mean like spam blacklist or such.

This is example service which shows blacklist status:
SPAM list - http://www.senderbase.org/ (allows checking of the IP subnet), http://www.uceprotect.net/en/rblcheck.php , http://www.sorbs.net/lookup.shtml

bulk IP blacklist checkers: http://www.blacklistmaster.com/ ; http://mxtoolbox.com/blacklists.aspx

But these above mentioned DO NOT notiffy one when IP is blacklisted..

// Update: if some blacklist monitor has an permalink for certain IP results, then such webpage can be monitored by these tools