> Recently I hv a requirement to subdelegate out any 3rd level domain of
> abc.com to another DNS server. Can I define as follow with a wild card
> ?


No. "* NS" has undefined semantics.

> Under the dbfile for the 2ndlevel.com zone file.
> $Origin abc.com IN SOA ....
> ..
> ..
> * IN NS svr1.def.com.
> svr1.def.com. IN A 55.55.55.55
>
>
> E.g, Anyone performing query to www.aaa.def.com; www.bbb.def.com;
> www.ccc.def.com; www.xxx.def.com ... will be forwarded to svr1.def.com
> name server.
>
> Thanks alot
> VSSS
>

--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@isc.org