sdig

Synopsis

sdig IP-ADDRESS-OR-DOH-URL PORT QNAME QTYPE [OPTION]

Description

sdig sends a DNS query to IP-ADDRESS-OR-DOH-URL on port PORT and displays the answer in a formatted way. If the address starts with an h, it is assumed to be a DoH endpoint, and PORT is ignored. If qname and qtype are both - and tcp is used, multiple lines are read from stdin, where each line contains a qname and a type. If the address is stdin, a DNS packet is read from stdin instead of from the network, and PORT is ignored. All input is literal and case sensitive. Queries need option recurse to expect a resource record reply if the query target is not known to be the authoritative server for that record.

Options

These options can be added to the commandline in any order.

class CLASSNUM
Send the query in the numbered class (like 3 for CHAOS) instead of the default 1 (for IN).
dnssec
Set the DO bit to request DNSSEC information.
ednssubnet SUBNET
Send SUBNET in the edns-client-subnet option. If this option is not set, no edns-client-subnet option is set in the query.
hidesoadetails
Don’t show the SOA serial in the response.
hidettl
Replace TTLs with [ttl] in the response.
proxy TCP? SRC DST
Wrap query in PROXYv2 protocol with these parameters. The first parameter accepts 0 for UDP and 1 for TCP. The second and third take IP addresses and port.
recurse
Set the RD bit in the question.
showflags
Show the NSEC3 flags in the response (they are hidden by default).
tcp
Use TCP instead of UDP to send the query.
xpf XPFCODE XPFVERSION XPFPROTO XPFSRC XPFDST
Send an XPF additional with these parameters.

Examples

Simple queries to local resolvers
sdig 127.0.0.1 53 example.com AAAA recurse sdig ::1 53 example.com A recurse
Query to a DNS-over-HTTPS server requesting dnssec and recursion
sdig https://dns.example.net/dns-query 443 example.com A dnssec recurse