"Andy Hall" aka Matt wrote in message
...

I do in fact. And I know they are allocated dynamically and that service
and backbone providers may have the same blocks of addresses. Many
service providers may use the same backbone provider and all come out at
the same hub.

No you don't.

I do, Matt. You just copied all that out of a bad book.

- IP addresses *may* be allocated to end users dynamically. They *may*
be assigned statically.

To individual ISP accounts they will be dynamic. The one seen could be the
ISP or backbone providers which may be static.

It depends on the infrastructure of the ISP and the agreement between the
ISP and end user. Typically dynamic public IP addressing, where it is
used is for entry level ISP packages for a single computer.

Your book got that right there.

For customers needing to run fixed servers and needing multiple addresses,
it is usual to use statically allocated addressing.

Matt, that is commercial which is not the issue.

- IP address blocks are allocated by Regional Internet Registries (e.g.
RIPE, ARIN, APNIC...) to Local Internet Registries (often ISPs) who are
then responsible for their distribution.

We all know that. But you can allocate your sub address behind a server.
Juts have to know how to work them out.

- Any ISP worth using does not just have one backbone provider, he will
have several for reasons of resilience and differing commercial terms. He
will also make sure that his peering connections are in different
geographical locations. The major backbone providers certainly make sure
that they have many points of presence. So, no, all don't "come out at
the same hub".

In an area they will. You will see that in your grotty little town, they
come out the same one.

Matt, you can never get anything right can you?