reverse DNS problem on LAN

Good morning,

I have just read RFC 2317 http://www.simpledns.com/rfc/rfc2317.txt, employed
it.
Neither ISP nor registrar do not provide me yet with reverse DNS.
Nontheless I had it set up reverse DNS in named.conf:

zone "227.138.198.in-addr.arpa" {
type master;
file "227.138.198.in-addr.arpa";
}

and I could look up any of my addresses from my CIDR 198.138.227.64/26

nslookup 198.138.227.87 on my LAN did give me proper DNS name,

to have it set for Internet I understand it will have to be set up at my
Reverse DNS provider (IPS or registrar ?) and delegated to me.
After it, as I understand, it would be enought to change only named.conf to:

zone "65-126.227.138.198.in-addr.arpa" {
type master;
file "227.138.198.in-addr.arpa";
}
or in RFC notation

zone "64/26.227.138.198.in-addr.arpa" {
type master;
file "227.138.198.in-addr.arpa";
}

I did that before calling (ISP or registrar) and my reverse DNS is not
working on my LAN ?
(I'm getting: server can't find 87.227.138.198.in-addr.arpa: NXDOMAIN) after
nslookup 198.138.227.87

When I repleace in named.conf

zone "64/26.227.138.198.in-addr.arpa" {

with

zone "227.138.198.in-addr.arpa" {

as it was, it works again.

Is it normal ? Would it work on the Internet after delegating it and do not
work on my LAN ?
Can it be set up to work on Internet and my LAN in the some time.
Should registrar DNS named.conf file look like this:

zone "227.138.198.in-addr.arpa" {
type slave;
file "227.138.198.in-addr.arpa";
masters {198.138.227.66 my DNS; IP addreses of other companies DNS's};
}

227.138.198.in-addr.arpa file:
...
64/26 NS ns1.my.domain.
64/26 NS ns2.my.domain.
…
$GENERATE 65-126 $ CNAME $.64/26.227.138.198.in-addr.arpa.
…
I would really appreciate if anyone would give me any hints or answers to my
questions.

Best Regards
Slawomir Orlowski