[CrazyStat]

Dynamic in theory, but for many people the IP is unchanged for a long time. I remember reading an article that said the average length of time between dynamic IP changes tracked by some company was something like seven months, though I can't find it now.

I have cable with a theoretically dynamic DNS but it's changed once in >4 years.

[3xblah]

Can you be sure that during 4yrs it never changed >1 even for a short time, maybe hours or days, then reverted back

[marcan_42]

That's not really a thing. The pools are large-ish; the chances of winding back on the same IP after a change are tiny.

[3xblah]

Not speaking for all ISPs worldwide.

[3xblah]

Maybe running dynamic DNS client that keeps logs of IP address changes. Do DDNS clients keep logs. Maybe passive DNS would detect changes.

The point of the comment was that cannot just assume it never changed unless monitoring it contiuously.

[makapuf]

Well if you don't notice it, for a home vpn, well... you wont notice it.