I believe you want:

$ sudo route add -inet6 -net -blackhole 2607:f2f8:: -prefixlen 32 ::1 
-- 
Todd Fries .. t...@fries.net

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Penned by Garry Dolley on 20090406 19:29.46, we have:
| Hey misc@,
| 
| I'm trying to install a null route for an IPv6 block, but I get:
| 
| $ sudo route add -inet6 2607:f2f8::/32 ::1 -blackhole
| route: 2607:f2f8::/32: bad value
| 
| What is bad about that v6 address?
| 
| Note that even when omitting -blackhole, it will still error.
| 
| I'm running OpenBSD 4.4 on amd64 arch.  Stock GENERIC kernel.
| 
| I'm sure it's simple but I don't deal w/ OpenBSD routers much.
| 
| Thanks.
| 
| -- 
| Garry Dolley
| ARP Networks, Inc. | http://www.arpnetworks.com | (818) 206-0181
| Data center, VPS, and IP Transit solutions
| Member Los Angeles County REACT, Unit 336 | WQGK336
| Blog http://scie.nti.st

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