HTTPS is secure and is on port 443. Information that travels on port 443 is encrypted using Secure Sockets Layer (SSL) or its new version, Transport Layer Security (TLS). Using HTTPS also helps minimize an attack by a hacker by…
MX Lookup means to perform the MX Record Lookup in the DNS. It is used to check the MX Record to find the internal & external mail servers for a particular domain. MX Record The DNS MX record is a…
This post describes how to see TCP connection establishment and termination as packets using tcpdump on linux. Preparing Install the following commands on our linux. Start a TCP connection establishment $ nc -lk 12345 $ netstat -anp | grep 12345…
In networking, a port is a virtual place on a machine that is open to connections from other machines. Every networked computer has a standard number of ports, and each port is reserved for certain types of communication. Think of…
DNS propagation is the time for DNS record updates to take effect on all servers. DNS Changes are not instant because nameservers cache domain record information for a specific duration before refreshing. Some users may still be served a cached…
CrazyGames is a free online games website with more than 10 million active users monthly. The company was founded in 2014 by Tomas and Raf Mertens and has grown to 9 people. The platform features games ranging from 3D shooters…
Reverse DNS lookup, also known as rDNS, is used to determine or resolve the IP address associated with the domain name. It is simply an entry that resolves an IP address back to a hostname. It is also called PTR…
DNS A record maps a domain name to the IP address (Version 4) of the server hosting the domain. The “A” stands for “address”. DNS A record indicates the IP address of a given domain. DNS A record is the…
A DNS, or Domain Name Server, is what helps translate human-friendly URLs into computer-friendly IP addresses. This is what enables our devices to connect to the internet and access the content we want to see. When people change their DNS,…
The OpenSSL s_client command is a helpful test client for troubleshooting remote SSL or TLS connections. This post covers various examples of testing SSL connections with different ciphers, TLS versions, and SSL server certificate analysis. OpenSSL s_client connect openssl s_client…
