Non-authoritative answer:
unc.edu
origin = ns.unc.edu
mail addr = shava.ns.unc.edu
serial = 930408
refresh = 28800 (8 hours)
retry = 3600 (1 hour)
expire = 1209600 (14 days)
minimum ttl = 86400 (1 day)
Authoritative answers can be found from:
UNC.EDU nameserver = SAMBA.ACS.UNC.EDU
SAMBA.ACS.UNC.EDU internet address = 128.109.157.30
>exit
同样，可以使用set type查询MX记录，或修改成专用查询类型ANY，ANY可以用来取得指定主机的所有可用资源记录。
> set type=MX
> unc.edu
Non-authoritative answer:
unc.edu preference = 10, mail exchanger = lambada.oit.unc.edu
lambada.oit.unc.edu internet address = 152.2.22.80
Authoritative answers can be found from:
UNC.EDU nameserver = SAMBA.ACS.UNC.EDU
SAMBA.ACS.UNC.EDU internet address = 128.109.157.30
>exit
nslookup命令的另一个应用为named.ca文件是获取当前根服务器的列表。我们可以使用set type=NS来查询所有的根域名服务器：
$ nslookup
Default Name Server: rs10.hrz.th-darmstadt.de
Address: 130.83.56.60
> set typ=NS
> .
Name Server: fb0430.mathematik.th-darmstadt.de
Address: 130.83.2.30
Non-authoritative answer:
(root) nameserver = NS.INTERNIC.NET
(root) nameserver = AOS.ARL.ARMY.MIL
(root) nameserver = C.NYSER.NET
(root) nameserver = TERP.UMD.EDU
(root) nameserver = NS.NASA.GOV
(root) nameserver = NIC.NORDU.NET
(root) nameserver = NS.NIC.DDN.MIL
Authoritative answers can be found from:
(root) nameserver = NS.INTERNIC.NET
(root) nameserver = AOS.ARL.ARMY.MIL
(root) nameserver = C.NYSER.NET
(root) nameserver = TERP.UMD.EDU
(root) nameserver = NS.NASA.GOV
(root) nameserver = NIC.NORDU.NET
(root) nameserver = NS.NIC.DDN.MIL
NS.INTERNIC.NET internet address = 198.41.0.4
AOS.ARL.ARMY.MIL internet address = 128.63.4.82
AOS.ARL.ARMY.MIL internet address = 192.5.25.82
AOS.ARL.ARMY.MIL internet address = 26.3.0.29
C.NYSER.NET internet address = 192.33.4.12
TERP.UMD.EDU internet address = 128.8.10.90
NS.NASA.GOV internet address = 128.102.16.10
NS.NASA.GOV internet address = 192.52.195.10
NS.NASA.GOV internet address = 45.13.10.121
NIC.NORDU.NET internet address = 192.36.148.17
NS.NIC.DDN.MIL internet address = 192.112.36.4
>exit
利用nslookup的help命令或？，我们可以得到nslookup的完整命令列表。例如：
>help
Commands: (identifiers are shown in uppercase, [ ] means optional)
NAME - print info about the host/domain NAME using default server
NAME1 NAME2 - as above, but use NAME2 as server
help or ? - print info on common commands; see nslookup(1) for details
set OPTION - set an option
all - print options, current server and host
[no]debug - print debugging information
[no]d2 - print exhaustive debugging information
[no]defname - append domain name to each query
[no]recurse - ask for recursive answer to query
[no]vc - always use a virtual circuit
domain=NAME - set default domain name to NAME
srchlist=N1[/N2/.../N6] - set domain to N1 and search list to N1,N2,etc.
root=NAME - set root server to NAME
retry=X - set number of retries to X
timeout=X - set initial time-out interval to X seconds
querytype=X - set query type, e.g., A, ANY, CNAME, HINFO, MX, PX, NS, PTR, SOA, TXT, WKS, SRV, NAPTR
port=X - set port number to send query on
type=X - synonym for querytype
class=X - set query class to one of IN(Internet), CHAOS, HESIOD or ANY
[no]recurse - ask for recursive answer to query
[no]vc - always use a virtual circuit
domain=NAME - set default domain name to NAME
srchlist=N1[/N2/.../N6] - set domain to N1 and search list to N1,N2,etc.
root=NAME - set root server to NAME
retry=X - set number of retries to X
timeout=X - set initial time-out interval to X seconds
querytype=X - set query type, e.g., A, ANY, CNAME, HINFO, MX, PX, NS, PTR, SOA, TXT, WKS, SRV, NAPTR
port=X - set port number to send query on
type=X - synonym for querytype
class=X - set query class to one of IN(Internet), CHAOS, HESIOD or ANY
server NAME - set default server to NAME, using current default server
lserver NAME - set default server to NAME, using initial server
finger [USER] - finger the optional USER at the current default host
root - set current default server to the root
ls [opt] DOMAIN [> FILE] - list addresses in DOMAIN (optional: output to FILE)
-a - list canonical names and aliases
-h - list HINFO (CPU type and operating system)
-s - list well-known services
-d - list all records
-t TYPE - list records of the given type(e.g.,A,CNAME,MX,etc.)
view FILE - sort an 'ls' output file and view it with more
exit - exit the program, ^D also exits
当我们使用nslookup这一工具时，我们将会发现很多有帮助的功能。