Every host in the subscription is assigned a tracking method - IP address, DNS Hostname or NetBIOS hostname. Here's some helpful information if you choose to track hosts by DNS and/or NetBIOS hostname.
For hosts that have been successfully scanned, you can change the tracking method to DNS or NetBIOS hostname if the hostname was collected during a previous scan. This limit does not apply to hosts that have never been scanned, and hosts that have been purged and not scanned after purging.
A host's IP address may be resolved to two or more hostnames by different scans. If you change the tracking method for such a host to IP address, then the most recent vulnerability data for the IP will be saved and old data must be purged.
For example, during a scan of IP 10.10.10.1 on October 3, the hostname detected is HOSTA. During a scan of this same IP a month later on November 3, the hostname detected is HOSTB. If you change the tracking method to IP address for either of these hosts, then vulnerability information from the older scan on October 3 will be purged and vulnerability information from the more recent scan on November 3 will be saved.
If not, the host will not be scanned. In the scan results, the host will be listed in the "Hosts Not Scanned" appendix under "Hostname Not Found". This appendix only appears in scan results.
Tips for scanning NetBIOS tracked hostsTips for scanning NetBIOS tracked hosts
Include UDP port 137 in the scan options applied to the task. This port is automatically included when the "Scanned UDP Ports" option is set to Standard Scan, Light Scan or Full in your option profile.
Tips for scanning DNS tracked hostsTips for scanning DNS tracked hosts
Make sure that your DNS servers are configured to communicate with scanners - cloud scanners for perimeter scanning and/or scanner appliances for scanning your internal network. Your DNS servers must be able to resolve the target IP addresses to hostnames. You'll find IP addresses for our cloud scanners on the Account Info page (Help > Account Info).
Hosts will be sorted by hostnameHosts will be sorted by hostname
Hosts assigned the DNS or NetBIOS tracking method will be listed in alphabetical order by hostname. Hosts assigned the IP tracking (the default) will be listed in numerical order by IP address.
A host's IP address may be resolved to two or more hostnames by different scans. In this case each hostname will appear as a separate host in your host assets list and in scan reports. You'll see the same IP address multiple times with different hostnames.