Added examples

Author: jchook

README.md

@@ -2,10 +2,10 @@
 
 Reverse IP utility.
 
-Allows you to easily reverse IPs in your UNIX workflow for PTR or RBL
+Easily reverse IPs in your workflow, e.g. for PTR or RBL
 lookups.
 
-## Example
+## IPv4 Example
 
 ```bash
 iprev 185.143.223.168 
@@ -17,4 +17,31 @@ Will produce
 168.223.143.185.
 ```
 
+## IPv6 Example
+
+```bash
+iprev 2a02:790:1:d::100:164
+```
+
+Will produce
+
+```
+4.6.1.0.0.0.1.0.0.0.0.0.0.0.0.0.d.0.0.0.1.0.0.0.0.9.7.0.2.0.a.2.
+```
+
+## RBL lookup example
+
+Easily check popular blocklists for an IP.
+
+```bash
+dig +noall +answer $(iprev 185.143.223.168)zen.spamhaus.org
+```
+
+## PTR Lookup Example
+
+Get the hostname from an IP address.
+
+```bash
+dig +short PTR $(iprev 52.203.88.233)in-addr.arpa
+```