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For a while, I've been getting these errors showing up in my PHP log:

Question2Answer fatal error: User registration is handled by external code

I assume an ordinary visitor has no opportunity to create such an error, so this led me to assume it was a spammer of some sort.  So, I started logging IP addresses for this error, and it turns out to be a single IP address:

trying repeatedly to register on my WP-integrated Q2A site, which of course is impossible.

A reverse IP lookup gives the following domain:


Any idea what this might be?  If it's a spammer, then here's their IP for everyone, it seems like they're sniffing for Q2A, so better block them.

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