How to Use the Local Internet Registry's Assignment Window for its
End Users
This example illustrates how the Local Internet Registry (LIR)’s
Assignment Window (AW) is used:
How an LIR chooses whether or not to request approval from
the RIPE
NCC by filling out a “PROVIDER AGGREGATABLE (PA) ASSIGNMENT REQUEST
FORM” when
making an assignment to an End User. To decide, the LIR has to ask itself the
following question:
Q: How many IP addresses can I assign today to
an End User without having to ask for an approval?
A: Count back 12 months to find out!
i.e. Add up all the assignments to that End User within the last 12
months (excluding assignments approved by the RIPE NCC). (let
say the sum = x)
The number of additional IP addresses needed to reach your LIR's AW
is the size of the assignment you can give them today without having
to ask for approval. (AW-x)
Let us suppose the LIR nl.animals received an AW of /21 from the RIPE NCC.
nl.animals has 3 End Users: Redfox Ltd, Greenfish
Ltd and Pinkcat Ltd.
In the diagrams below the timelines are horizontal.
The number of IP addresses that can be assigned directly at any time
(without needing approval from the RIPE NCC) is represented by the height
of the shaded area.
Assignments
are represented
by boxes and vertical arrows. Pink boxes represent assignments requested
from the RIPE NCC. 
Note that assignments that have been requested from the
RIPE NCC (represented by pink boxes) are not counted when adding
up all assignments made for a certain End User within the LIR’s
AW.
You can find a detailed explanation of this example in Section
7.6 in
the
LIR Training Course Reference Booklet: MSWORD | PDF
All training material can be found at: http://www.ripe.net/training/lir/material/
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