Carlos's port 300 server has been shut down, so now the list of servers is as follows:

new update: 25.03.2008 18:00 GMT

NPLB LLRnet server #1:
maintained by IronBits
server = "llrnet.ironbits.net" NEW SERVER ADDRESS !
port = 5000
current range: 301 <= k <= 399, n = ~ 444.2k ( upto 460k ~27,500 pairs)
Report: http://llrnet.ironbits.net/index.html

NPLB LLRnet server #2:
maintained by Adam Sutton (AES)
server = "nplb.rieselprime.org"
port = 300
current range: 401 <= k <= 1001, n = ~ 397.3k (upto 400k ~ 31,000 pairs)
Stats: http://nplb.rieselprime.org/stats/stats.php?a=reset

Note:
n > 333k is Top5000 range