More than four name server for whois record

[Stephane Bortzmeyer]

On Sun, Mar 01, 2009 at 11:41:22AM -0800,
 Chris Henderson <henders254 at gmail.com> wrote 
 a message of 8 lines which said:

> I cannot put more than four name servers in the domain management
> web interface

Bad "domain management Web interface", use another one (four is a very
low limit). 

What software is it (BIND has no such interface, hence, I presume,
Steinar Haug's remark)?