June 21, 2020
Why are IPv4 Addresses Divided into Four Sections?
All IPv4 addresses are shown in four sections separated by dots. Below is a quick look at what these sections represent and why all IP addresses have this in common. Computers translate everything into their own language to understand what is being communicated to them. These are a combination of zeroes and ones, which is collectively known as a binary system. So every decimal number is broken into a binary number by the computer to read it. For instance, the number 255 is 11111111 in binary form. Every binary number has eight numbers, which are called “bits” in the binary system. All IPv4 addresses are made up of 32 bits. So an IP address that shows up as 76.240.249.145 on[…]
June 10, 2020
How Does IP Addresses Work? – Infographic
A URL is linked to an IP address. After entering it on the URL bar, the web browser will look for the related IP address in its cache first, then your OS’s cache, and thirdly in the router’s DNS cache. If it does not find it anywhere there, the web browser will communicate with the ISP’s DNS server. This server also caches DNS entries. After finding the right IP address, the browser will create a TCP/IP connection with that website’s server, which will match the address to transfer data. After that, it will send an HTTP request to that web server, which will send back an HTTP response, and then, the HTML will start rendering on it. Here is a[…]
June 9, 2020
Tips to Remove your IPv4 Address from a Blacklist
IPv4 address blacklisting is done to control spam and prevent malicious activities. Every blacklist has its own set of criteria for blacklisting IP addresses of email spammers, which could be based on technical factors, ISP policy, and evidence-based. Technical blacklisting usually happens due to mail servers configuration issues, such as improper reverse DNS records and banner greetings, and mail servers operating within a range of suspicious IPv4 address blocks. ISP policy-based blacklisting is done when the receiving server decides not to accept emails from specific countries or ISPs, which are known for not following unsubscribe requests properly. Evidence-based blacklisting refers to those cases wherein the server has reliable proof to block an IPv4 address block because it has been involved[…]
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