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 <[email protected]> 
Sent: Friday, June 19, 2026 3:47 PM
To: [email protected]
Cc: Marco Moock <[email protected]>
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

Junk-Mail bitte an [email protected] 
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