Nmap also supports a number of performance and reliability features such as dynamic delay time calculations, packet timeout and retransmission, parallel port scanning, detection of down hosts via parallel pings. Nmap supports Vanilla TCP connect() scanning, TCP SYN (half open) scanning, TCP FIN, Xmas, or NULL (stealth) scanning, TCP ftp proxy (bounce attack) scanning, SYN/FIN scanning using IP fragments (bypasses some packet filters), TCP ACK and Window scanning, UDP raw ICMP port unreachable scanning, ICMP scanning (ping-sweep), TCP Ping scanning, Direct (non portmapper) RPC scanning, Remote OS Identification by TCP/IP Fingerprinting, and Reverse-ident scanning. Theres really no perceptible delay there. It can be used to identify live hosts, scan TCP and UDP open ports, detect firewalls, get versions. With the command you posted, the only service information is generated with a simple lookup of the port number.

Not to mention the fact that you may want to scan different protocols (UDP, TCP, ICMP, etc.). Nmap is probably the most used port scanner in the world. In some cases, bypassing firewalls may be required. Sometimes you need speed, other times you may need stealth. Nmap is a utility for port scanning large networks, although it works fine for single hosts. Nmap binaries for Mac OS X (Intel x86) are distributed as a disk image file containing an installer. Nmap Port Scanner 7.91 Nmap Port Scanner 7.91 Posted Authored by Fyodor | Site Optional Zenmap GUI (all platforms): Source RPM (includes Nmap, Zenmap, Ncat, and Nping):.

Zenmap port scanner