To get a quick start, I assigned numbers to the current servers.
Please add this number in the correct ircd.conf (if you have more)
as follows:

Example:

M:Amsterdam.NL.EU.undernet.org::Linux server at Runs home:7004

Becomes:

M:Amsterdam.NL.EU.undernet.org::Linux server at Runs home:7004:1

Where you should use the number in the first column below instead
of the '1' :). If your servername is not listed here, please
contact routing-com@undernet.org for your own number (only if you
actually connect to UnderNet ofcourse), do not use an unused number
because this list may be incomplete.

Run

1   Amsterdam.NL.EU.undernet.org
2   Baltimore.MD.US.Undernet.Org
3   Caen.Fr.Eu.UnderNet.org
4   Dallas-Test.TX.US.Undernet.org
5   Chicago-R.IL.US.Undernet.org
6   Chicago.IL.US.Undernet.org
7   Dallas.Tx.US.Undernet.org
8   Des-Moines.IA.US.Undernet.Org
9   Diemen.NL.EU.undernet.org
10  Dallas-R.TX.US.Undernet.org

11  London.UK.eu.Undernet.org
12  Lulea-R.se.eu.undernet.org
13  Antwerpen.BE.Eu.Undernet.org
14  Norman-r.ok.us.undernet.org
15  Oslo-R.NO.EU.Undernet.org
16  Regensburg.DE.EU.undernet.org
17  RockHill.SC.US.Undernet.Org
18  SaltLake.UT.US.UnderNET.Org
19  SanDiego.CA.US.Undernet.org
20  Almere.NL.Eu.Undernet.org

21  StLouis.MO.US.UnderNet.org
22  Uworld.undernet.org
23  Uworld2.undernet.org
24  Oslo1.NO.Eu.Undernet.org
25  Vancouver.BC.CA.Undernet.Org
26  ann-arbor.mi.us.undernet.org
27  auckland.nz.undernet.org
28  aunet.
29  austin.tx.us.undernet.org
30  channels.undernet.org

31  channels2.undernet.org
32  gateway1.undernet.org
33  los-angeles.ca.us.undernet.org
34  lowell.ma.us.undernet.org
35  montreal.qu.ca.undernet.org
36  okc.ok.us.undernet.org
37  phoenix.az.us.undernet.org
38  Goettingen.DE.Eu.Undernet.org
39  springfield.mo.us.undernet.org
40  toronto.on.ca.undernet.org

41  washington-1.dc.us.undernet.org
42  washington-2.dc.us.undernet.org
43  newbrunswick.nj.us.undernet.org
44  lasvegas.nv.us.undernet.org
45  washington-r.dc.us.undernet.org
46  washington.dc.us.undernet.org
47  protocol.undernet.org
