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The port might be consumed by rpcbind. What rpcbind does, is described here An excerpt: When a client signs up for a given interface on a particular host, usually with a clnt_create() call, the stub code asks rpcbind on that host a question, something like "on what UDP or TCP port is protocol number X listening?" rpcbind, unlike most other ONC ...


NOTE: All of this assumes you are talking about TCP 111 (vs UDP). If you are using a VPN service, you are sharing that Public IP with many customers and being NAT'd somewhere along the way. This Public IP is generally not directly routable to you as a user of the service, as such, there isn't much to worry about. That being said, it's hard to know (...


Yes, Nmap can take a file in the services file format with the --servicedb option. This also implies the -F option, meaning that only the services listed in that file will be scanned.* So just supply the services you want to scan in this format and you can accomplish this goal. * The exception to this is if the file includes port frequency data like the ...


Yes, it can, by using the targets-xml Nmap NSE script Update: Actually, the functionality isn't yet in there, but it looks as if it is planned.


Not by itself, no. But with some quick scripting you can. For example, on *nix systems: nmap -p `cat ports.list` ... This would allow you to maintain a list of ports in a file in a CSV format. If you would prefer to have one port per line, you can do this (thanks @bonsaiviking) on *nix systems: nmap -p $(tr '\n' , <ports.list)

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