My ISP is changing upstreams for a variety of reasons around May 18th. 1. I have a /24 SWIPed to me, 205.238.207.0. The ARIN listing doesn't say it's non-portable, so can I take it with me? And if I do, how likely is it that the new ISP's announcement will get installed in backbone routers rather than filtered for being too long? It's right in the middle of the old upstream's block 205.238.192/18. 2. Assuming I have to renumber, I have a whole bunch of virtual domains all DNS served from one server in the renumbered space called ivan.iecc.com. (There's other servers elsewhere that won't get renumbered.) If I tell the Internic that ivan's host number has changed, will that update all the domains served from it? TIA. Regards, John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies", Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner Finger for PGP key, f'print = 3A 5B D0 3F D9 A0 6A A4 2D AC 1E 9E A6 36 A3 47