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XMAS scans: XMAS scans are even quieter and less noticeable by firewalls.

ItвЂ™s a quick and sneaky technique aimed at finding potential open ports on target devices. This scan only sends a SYN message and doesnвЂ™t complete the connection, leaving the target hanging.

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Half-open or SYN scans: A half-open scan, or SYN (short for synchronize) scan, is a tactic that attackers use to determine the status of a port without establishing a full connection.

IT administrators may use this technique to troubleshoot, or disable the ping scan by using a firewall - which makes it impossible for attackers to find the network through pings.

Ping scans are internet control message protocol (ICMP) requests and send out an automated blast of several ICMP requests to different servers to bait responses. In a network, a ping is used to verify whether or not a network data packet can be distributed to an IP address without errors.

Ping scans: The simplest port scans are called ping scans.

Listed below are a few of the techniques and how they work: ItвЂ™s important to note that cybercriminals will also choose a specific port scanning technique based on their goal, or attack strategy. There are several techniques for port scanning, depending on the specific goal. What are the different port scanning techniques? Using these two protocols, there are several different techniques for performing port scans. Data sent via the UDP protocol is delivered without concern for the destination therefore, it is not guaranteed that the data will even make it. While TCP is a reliable, two-way connection-based transmission of data that relies on the destinationвЂ™s status in order to complete a successful send, UDP is connectionless and unreliable. They are both data transmission methods for the internet but have different mechanisms. The general protocols used for port scanning are TCP (transmission control protocol) and UDP (user datagram protocol). What are the protocols used in port scanning? Ports 49,151 through 65,536 are dynamic and private ports - and can be used by nearly everyone.

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Numbers 1024 through 49151 are considered вЂњregistered portsвЂќ meaning they are registered by software corporations.

Port 80 (TCP) is the World Wide Web HTTP.

Port 53 (UDP) is the Domain Name System (DNS) which translates names to IP addresses.

Port 22 (TCP) holds Secure Shell (SSH) protocol for secure logins, ftp, and port forwarding.

Port 20 (UDP) holds File Transfer Protocol (FTP) used for data transfer.You may recognize some of the more prominent ports and their assigned services: These ports are held by top-tier companies like Apple QuickTime, MSN, SQL services, and other prominent organizations. They are administered by the Internet Assigned Numbers Authority (IANA). Ports 0 to 1023 are well known port numbers that are designed for Internet use although they can have specialized purposes as well. Ports range from 0 to 65,536 and basically rank by popularity. The port number combined with an IP address form the vital information kept by every Internet Service Provider in order to fulfill requests.

Port numbers are used for consistency and programming. Think of it as the parking spot for data to be exchanged through electronic, software, or programming-related mechanisms. Computer ports are the central docking point for the flow of information from a program or the Internet, to a device or another computer in the network and vice versa.