--- a/dns.rst Sun Nov 12 13:52:54 2017 +0200
+++ b/dns.rst Wed Nov 15 11:17:24 2017 +0200
@@ -46,13 +46,19 @@
$ dig @8.8.8.8 A defun.work
$ dig +nocmd +noall +answer defun.work
-Host name from IP.
-==================
+Host name from IP
+=================
If that information available::
$ nslookup -type=ptr 8.8.8.8
+ $ dig @8.8.8.8 -x 8.8.4.4
+ $ dig +noall +answer @8.8.8.8 PTR 4.4.8.8.in-addr.arpa
+ 4.4.8.8.in-addr.arpa. 21599 IN PTR google-public-dns-b.google.com.
+
+ $ host 8.8.4.4
+ 4.4.8.8.in-addr.arpa domain name pointer google-public-dns-b.google.com.
List authoritative NS for domain.
=================================