[tobster@kiruna ~]$ dig +short smtp.1und1.de A
212.227.15.167
212.227.15.183
[tobster@kiruna ~]$ dig smtp.1und1.de MX
; <<>> DiG 9.9.4-P2-RedHat-9.9.4-12.P2.fc20 <<>> smtp.1und1.de MX
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3805
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;smtp.1und1.de. IN MX
;; AUTHORITY SECTION:
1und1.de. 373 IN SOA rns.ui-dns.de. dnsadmin.1und1.de. 2013084659 10800 3600 604800 86400
;; Query time: 1 msec
;; SERVER: 192.168.199.100#53(192.168.199.100)
;; WHEN: Mon Mai 12 19:22:40 CEST 2014
;; MSG SIZE rcvd: 98