In the grepable mode, each host is placed on the same line with the format <field name>: <value>, and each field is separated by tabs (\t). The number of fields depends on what Nmap options were used for the scan.
There are eight possible output fields:
- Host: This field is always included, and it consists of the IP address and reverse DNS name if available
- Status: This field has three possible values--up, down, or unknown
- Ports: In this field, port entries are separated by a comma and a space character, and each entry is divided into seven fields by forward slash characters (/)
- Protocols: This field is shown when an IP protocol (-sO) scan is used
- Ignored: This field shows the number of port states that were ignored
- OS: This ...