Linux/DNS
< Linux
host (scripting)
dig (testing)
- install
apt install dnsutils
- Basic query
dig google.com
- Query all record types
dig google.com ANY
- Query specific DNS server
dig google.de @8.8.8.8
- Reverse DNS lookup
dig -x 193.99.144.80
- Trace DNS path
dig google.com +trace
nslookup
nslookup google.com nslookup -query=ANY google.com
DNS entry
$TTL 86400 @ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( 2000091604 ; Serial 14400 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ) ; Minimum @ IN NS ns1.first-ns.de. @ IN NS robotns2.second-ns.de. @ IN NS robotns3.second-ns.com. localhost IN A 127.0.0.1 @ IN A 1.2.3.4 www IN A 2.3.4.5 www IN AAAA 2001:db8::1 mail IN A 2.3.4.5 loopback IN CNAME localhost pop IN CNAME www smtp IN CNAME www relay IN CNAME www imap IN CNAME www ftp 3600 IN CNAME ftp.anderedomain.de. @ IN MX 10 mail technik IN A 5.6.7.8 technik IN MX 10 technik @ IN TXT "v=spf1 mx -all"
DNS entry types
- ANY (all types)
- A (Host address)
- AAAA (IPv6 host address)
- ALIAS (Auto resolved alias)
- CNAME (Canonical name for an alias)
- MX (Mail eXchange)
- NS (Name Server)
- PTR (Pointer)
- SOA (Start Of Authority)
$TTL 86400 @ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( 2000091604 ; Serial 14400 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ) ; Minimum
- SRV (location of service)
- TXT (Descriptive text)