query SRV RR with nslookup

[David Ding]

I'd like to query SRV RRs on a DNS. Following is what I did with nslookup.
> server 10.32.122.9
Default Server:
Address: 10.32.122.9

> set type=SRV
> aspentech.lab
Server:
Address: 10.32.122.9

aspentech.lab
primary name server = aspentechdc1.aspentech.lab
responsible mail addr = admin
serial = 226
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
I expected to see a list of SRV RRs. With ls -t SRV aspentech.lab command I can see all SRV RRs but I think that this is a zone transfer not actual query. How can verify existance of thses SRV RRs with nslookup or any kind dns client query?

Thanks,

David