My IP, geo, request tools
My IP info, proxy headers
My IP, GEO info, country, city
My request $_SERVER vars
User-Agent tools
My User Agent information
Custom User Agent lookup
Email Address tools
Verify E-MAIL for exist
Trace E-MAIL sender location
Find E-MAIL box location
DNS and WHOIS tools
Find e-mail/domain MX
Domain lookup NS records
Domain A record Lookup
PTR lookup
Domain DNS Lookup
Domain WHOIS info Lookup
Advanced WHOIS Lookup Tool
Custom IP info, reverse lookup
IP info Lookup
Reverse Lookup
IP/Domain/Url Trace-Ping tools
Trace DOMAIN/IP
Online Ping
Check/Search Ports tools
Check PORTS for DOMAIN/IP
Search PORT description


Free online port scan tool,open port scan,remote port scan port

This content about technology of port scanner working.

Intro

Server can have lots of different services, tools, utils. But need to know how to connect to one needed service - not to all other, and give-request some info. Technology of division server connection zones by services - it's ports connections, each service linked with some one or several ports and when need to connect to it, other server connecting to some port that linked with needed service on destionation server box.

Start remote server port scan >>>


Technology

Technology of port scanner (free online port scan tool) working is very easy. User giving IP or Domain name, tool resolving it, and trying to connect to each port from user's list - doing open port scan. If during connection timeout destination not answering - port is closed, if connection success - remote port scan is opened.

A port scan is a series of messages sent by someone attempting to break into a computer to learn which computer network services, each associated with a "well-known" port number, the computer provides. Port scanning, a favorite approach of computer cracker, gives the assailant an idea where to probe for weaknesses. Essentially, a port scan consists of sending a message to each port, one at a time. The kind of response received indicates whether the port is used and can therefore be probed for weakness.