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nmap
"Nmap ("Network Mapper") is a free and open source (license) utility for network exploration or security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts."
root@fritz:/var/media/ftp/uData# nmap localhost
Starting Nmap 4.68 ( http://nmap.org ) at 2011-04-20 09:06 CEST
Interesting ports on localhost (127.0.0.1):
Not shown: 1699 closed ports
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
23/tcp open telnet
53/tcp open domain
80/tcp open http
81/tcp open hosts2-ns
111/tcp open rpcbind
443/tcp open https
1011/tcp open unknown
1012/tcp open unknown
2007/tcp open dectalk
2047/tcp open dls
5060/tcp open sip
8080/tcp open http-proxy
8123/tcp open polipo
8888/tcp open sun-answerbook
Nmap done: 1 IP address (1 host up) scanned in 4.598 seconds
Port Function Program/process Anmerkung
81 Freetz! inetd
82 AVM's Webfilter contfiltd bei Firmware 7270 05.05 auf Port 81
111 portmapper (nfs) portmap
1011 AVM's telefon-daemon telefon
1012 AVM's telefon-daemon telefon
2007 ??? telefon
2047 nfs v3 nfsd
8080 AVM's Kindersicherung ctlmgr.bin
8888 AVM's telefon-daemon telefon
Useful command:
netstat -anp