RE: IPv4 flag day

[Gary Sparkes via NANOG <nanog () lists nanog org>]

That's really the answer, for both v4 and v6, if you want to not have to renumber on provider changes every time. The 
answer's the same regardless of IPv4 vs IPv6, because the problems are the same. 

At least for this 

> So in IPv6 I either have to renumber because I ditched some ISP for another...or I have to pay for my addressing 
> space and my ISPs have to support routing my address space, right?

Yes, exactly like you had to for IPv4. 

-----Original Message-----
From: Marco Moock via NANOG <nanog () lists nanog org> 
Sent: Friday, June 19, 2026 3:47 PM
To: nanog () lists nanog org
Cc: Marco Moock <mm () dorfdsl de>
Subject: Re: IPv4 flag day

Am 19.06.26 um 21:21 schrieb Aaron C. de Bruyn:
> I don't want to renumber everything because I ditch one ISP and switch 
> to another.

Get your own prefix from RIR and let your ISP route it to your. If you switch the ISP, let the new ISP route it to you. 
It is even possible to have 2 ISPs that route the same prefix to you - without having you own ASN.

--
Gruß
Marco

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