Besides my very own website-spammer dnsbl, I've just started a "spider-dnsbl" based on the data at iplists.com.
It lists mostly all IPs of the following spiders:

It's updated twice a day and can be queried via: spider.dnsbl.kennmer.net

For example:

        ~# host 40.79.95.64.spider.dnsbl.kennmer.net
        40.79.95.64.spider.dnsbl.kennmer.net    A       127.0.0.8

So this IP belongs to "northern light"...

5000 Characters left