This documentation reflects version DiG 9.3.4-P1 , a more current version is DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.4
dig [gobal opts] hostname
[…]
|
| The completness of the response will vary from server to server and query to query!! To get the truth direct the query to the first NS(name server)
dig @`dig NS hostname +short|head -1` hostname -t ANY TTL is in seconds: 3600=1hour. 14400= 4hours; 86400 = 1day; For secondary servers this is the time REMAINING
|
> dig NS pppg.org ask any server
;; ANSWER SECTION:
pppg.org. 3600† IN† NS ns64.domaincontrol.com.
pppg.org. 3600 IN NS ns63.domaincontrol.com.
|
> dig @ns63.DOMAINCONTROL.COM ANY pppg.org ask the domain's Name Server pppg.org. 86400 3600† IN SOA ns63.domaincontrol.com. dns.omax.net. 2011013007† 28800† 7200† 604800† 86400† pppg.org. 3600 IN A 64.202.189.170 pppg.org. 3600 IN NS ns63.domaincontrol.com. pppg.org. 3600 IN NS ns64.domaincontrol.com. pppg.org. 3600 IN MX 0 smtp.secureserver.net. pppg.org. 3600 IN MX 10 mailstore1.secureserver.net. pppg.org. 3789 HINFO "ANY/RRSIG query Disabled" "See draft-ietf-dnsop-refuse-any" ;; ADDITIONAL SECTION: ns64.domaincontrol.com. 2897 IN A 208.109.255.42 ns63.domaincontrol.com. 597 IN A 216.69.185.42 smtp.secureserver.net. 208 IN A 72.167.238.201 |
Batch mode of operation from a file or use multiple lookups from the command line.
By default uses the servers in /etc/resolv.conf (which may have come from DHCP server)
User defaults in ${HOME}/.digrc are applied before the command line arguments ( no way to disable .digrc).
Output is in a form suitable for use in named.conf
with commentary information prefixed with
; which will be treated as comments.
hostname | resource record(s) to be looked up. |
server |
-t type type … some servers REFUSED multiple type codes
| A AAAA MX NS SOA HINFO TXT SIG SSHFP PRT RRSIG OPT CAA ANY AXF ( ANY does not include SRV)
DNS may refuse or provide minimal response to ANY
see IETF comment on RFC1035 rfc8482 Try querying the Name Server for more records.
Default: MX server for email messages, Format: … MX prio host where the server with the lowest priority is prefered.
TXT may contain information including
SRV query must be of form _service._protocol.host for example:
with LDAP, Kerbos, SIP wikipediaSOA Start Of Authority name of the server that supplied the data for the zone; the administrator of the zone; the current version of the data file; the number of seconds a secondary name server should wait before checking for updates; the number of seconds a secondary name server should wait before retrying a failed zone transfer; the maximum number of seconds that a secondary name server can use data before it must either be refreshed or expire; and a default number of seconds for the time-to-live file on resource records.
AAAA IPv6 address SIG provides signature (validation) data for another RRSet
SSHFP secure Shell key for verification see ssh,ssh-keygenCAA Certification Authority Authorization certificate authorities (CAs) allowed to issue certificates for .
OPTPTR reverse records
AXFR requests a zone transfer Usually denied. IXFR=nnnnnnnn. incremental zone transfer Usually deniedcontains the changes made to the zone since the serial number in the zone's SOA record was nnnnnnnn.Frequently the serial number used is in the form; yyyymmddNN where NN is incremented each time
the conf is changed in a given day.
see BIND .
IETF rfc1995bis
@ server |
+) and an optional no.
Supressing some output is useful when comparing queries that are expected to be the same.
For example since ttl keeps changing and stats includes the current time,
including them will result in differences which are not significant.
Simularly outputting version identification can be supressed using +nocmd
+noall |
Some of these set or reset flag bits in the query header
keywords are preceded by a plus (+).
keywords which set or reset an option and may be preceded by no.
keywords which assign values to options (like the timeout interval), have the form keyword=value.
+nonssearch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-f file, specifying multiple queries on the command line is permited, each can be supplied with its own set of flags, options and query options.
Each query argument represents an individual query in the command-line syntax, consisting of any of the standard options and flags, the name to be looked up, an optional query type and class and any query options applied to that query.
Global query options, applied to all queries,
precede the first hostname, class, type, options, flags, and query options
can be overridden by a query-specific set of query options. For example:
dig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
+qr is applied, so the initial query it made for each lookup. +noqr not output the initial query when it
looks up isc.org.IDN_DISABLE environment variable.
tip: The IN and CH class names overlap with the IN and CH top level domains names.
/etc/resolv.conf
${HOME}/.digrc
See host, named, dnssec-keygen, RFC1035.
dig [@global-server] [domain] [q-type] [q-class] {q-opt}
{global-d-opt} host [@local-server] {local-d-opt}
[ host [@local-server] {local-d-opt} …
Where:
domain is in the Domain Name System
q-class one of: in, hs, ch,… default: in
q-type one of: any, a, mx, ns, soa, hinfo, axf, txt,… default:a
Use ixfr=version for type ixfr
q-opt :
-q name -t type -c class
-f filename batch mode
-x dot-notation shortcut for in-addr lookups
-i IP6.INT reverse IPv6 lookups
-b address#port bind to source address/port
-p port
-4 -6 use IPv4/IPv6 query transport only
d-opt is of the form +keyword=value, where keyword is:
vc tcp TCP mode aka Virtual Circuit
+time=### timeout 5 sec.
+tries=### UDP attempts 3 +retry=### UDP retries 2
+domain=### default domainname
+bufsize=### EDNS0 Max UDP packet size
+ndots=###
+edns=###
search Set whether to use searchlist
showsearch Search with intermediate results
defname
recurse
ignore Don't revert to TCP for TC responses
fail Don't try next server on SERVFAIL
besteffort Try to parse even illegal messages
all Set or clear all output flags
aaonly Set AA flag in query aaflag
adflag Set AD
cdflag Set CD
cmd output command line
qr output question before sending
cl output class
comments question answer
authority additional stats
short ttlid (ommits type=txt)
nssearch Search all authoritative nameservers
identify ID responders in short answers
trace Trace delegation down from root
multiline output records in an expanded format
dnssec Request DNSSEC records
-k keyfile specify tsig key file
-y [hmac:]name:key (specify named base64 tsig key)
global d-opts and servers (before host name) affect all queries.
local d-opts and servers (after host name) affect only that lookup.
7/13/19
/usr/bin/dig @`/usr/bin/dig +short Real-World-Systems.com -t NS | head -1` Real-World-Systems.com -t A MX TXT NS SOA
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41712
;; flags: †qr aa† rd; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 4
Real-World-Systems.com. 14400 MX 20 spamalizer.midphase.com.
Real-World-Systems.com. 14400 TXT "v=spf1 +a +mx +ip4:209.236.71.20 +ip4:209.95.59.175 +ip4:209.236.71.17 +ip4:174.127.119.33 ~all"
Real-World-Systems.com. 86400 NS ns14.midphase.com.
Real-World-Systems.com. 86400 NS ns15.midphase.com.
Real-World-Systems.com. 14407 A 209.95.59.175
Real-World-Systems.com. 86400 NS ns16.midphase.com.
Real-World-Systems.com. 3600 MX 17 Real-World-Systems.com.
Real-World-Systems.com. 600 SOA ns14.midphase.com. domainmaster.uk2group.com. 2016120500 14400 7200 3600000 600
;; Query time: 61 msec
;; SERVER: 69.36.161.36#53(69.36.161.36)
;; WHEN: Sat Jul 13 08:12:34 EDT 2019
8/16/17 (notice OPT PSEDUOSECTION)
>usr/bin/dig $RWS -t any
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13645
;; flags: qr rd ra; QUERY: 1, ANSWER: 7, AUTHORITY: 0, ADDITIONAL: 4
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
;; ANSWER SECTION:
Real-World-Systems.com. 600 IN SOA ns14.midphase.com. domainmaster.uk2group.com. 2016120500 14400 7200 3600000 600
Real-World-Systems.com. 14400 IN TXT "v=spf1 +a +mx +ip4:209.236.71.17 +ip4:174.127.119.33 ~all"
Real-World-Systems.com. 86400 IN NS ns16.midphase.com.
Real-World-Systems.com. 86400 IN NS ns14.midphase.com.
Real-World-Systems.com. 86400 IN NS ns15.midphase.com.
Real-World-Systems.com. 14400 IN MX 0 spamalizer.midphase.com.
Real-World-Systems.com. 14407 IN A 174.127.119.33
;; ADDITIONAL SECTION:
ns14.midphase.com. 886 IN A 69.36.163.232
ns15.midphase.com. 12625 IN A 69.36.161.36
ns16.midphase.com. 10893 IN A 69.36.161.37
;; Query time: 187 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Wed Aug 16 15:28:16 EDT 2017
;; MSG SIZE rcvd: 336
dig +noall +answer -t any real-world-systems.com
real-world-systems.com. 14114 IN TXT "v=spf1 a mx ip4:67.228.235.89 ?all"
real-world-systems.com. 13835 IN A 67.228.235.89
real-world-systems.com. 13835 IN MX 0 real-world-systems.com.
real-world-systems.com. 53938 IN NS dns2.midphase.com.
real-world-systems.com. 53938 IN NS dns1.midphase.com.
+++ 2/15/12 from MI424WR router (repeated queries returns only A record or A,TXT,INx2,SOA and MX records go figure
dig +noall +answer -t any real-world-systems.com
real-world-systems.com. 600 IN TXT "v=spf1 ip4:209.236.71.17 ip4:174.36.146.71 a mx ip4:206.46.173.1/24 ?all"
real-world-systems.com. 600 IN A 174.127.119.33
real-world-systems.com. 86400 IN NS dns2.midphase.com.
real-world-systems.com. 86400 IN NS dns1.midphase.com.
real-world-systems.com. 600 IN SOA dns1.midphase.com. cpanel-admin.midphase.com. 2012021503 14400 7200 3600000 86400
real-world-systems.com. 600 IN MX 0 real-world-systems.com.
dig +noall +answer -t any real-world-systems.com
real-world-systems.com. 2981 IN TXT "v=spf1 ip4:209.236.71.17 ip4:174.36.146.71 a mx ip4:206.46.173.1/24 ?all"
real-world-systems.com. 76534 IN NS dns1.midphase.com.
real-world-systems.com. 76534 IN NS dns2.midphase.com.
compare gardenStateAudubonCouncil
cccu.us. 86367 IN RRSIG NSEC 5 2 86400 20110219155930 20110120152137 4787 US. FVbkawbzpPd5cKbvj24QSZJ1hDVawkohCA3+65kIVhZBp5EVqa6U0hjl +oP3ZMTYCM0v38ezLOKuKBZR0+rRS6UUaN+TWC77EoGY85LGe+o9Sz4x BXULGzhPzobdw1Rk1FrDLdo/MYNMjAe5946JXozyxVXJiqZJt+VGa9KC LpU= cccu.us. 86367 IN NSEC CCCUN.us. NS RRSIG NSEC
/etc/resolve.confdomain Germans nameserver 192.168.1.1 nameserver 71.250.0.12
cPanel creates autodiscovery. and autoconfiguration records records enable the Microsoft Outlook and Mozilla Thunderbird e-mail clients to automatically discover and configure access to e-mail accounts.
SERVFAIL if SOA's says NS is xxx, but xxx does not know about it!
Return codes:
0 Even if a NXDOMAIN or SERVFAIL returns!
So you should :
> dig -x 142.176.85.230|tee /tmp/$$ ;grep NOERROR /tmp/$$ > echo $? # rep will output 1 if that IP address reports an error
1 Invalid option, Usage Error10 is not a legal name (empty label); for example is address specified has training dot ex:142.12.13.13. 8 Couldn't open batch file 9 No reply from server, ;; connection timed out; no servers could be reacheddig @8.8.8.8 … ( google-public-dns-a.google.com )