What Is My ISP and Why Does It Show Up in IP Lookups?
Quick answer: Your ISP (Internet Service Provider) is the company that assigns your connection its public IP address, which is why an IP lookup tool typically shows the…
IPv4 Address Exhaustion: Why the World Is Running Out of IPv4
Quick answer: IPv4 only allows about 4.3 billion unique addresses, and that supply was effectively used up years ago as the number of connected devices grew far beyond…
How to Check If Your IP Address Is Blacklisted
Quick answer: Run your address through Blacklist Check to see whether reputation lists currently flag it, then review the listed reason before taking action.Common reasons an IP gets…
Static vs Dynamic IP Address: Which Do You Have?
Quick answer: A static IP address stays the same every time you connect; a dynamic IP address is reassigned periodically by your ISP from a shared pool. Most…
What Is DNS? How the Internet Turns Names Into Addresses
Quick answer: DNS (Domain Name System) is the internet’s directory service — it translates a name you type, like example.com, into the IP address computers actually use to…
What Does an IP Blacklist Listing Mean?
Quick answer: A blacklist listing means a reputation service has associated an IP or range with traffic it considers abusive, suspicious or unwanted.Why listings happenCommon triggers include spam,…
What Is an ASN and Why Does It Matter?
Quick answer: An ASN identifies an autonomous system, a network under one administrative routing policy. ASNs are a key part of how networks exchange routes on the internet.ASN…
How Reverse DNS Lookup Works: PTR Records Explained
Quick answer: Reverse DNS uses a PTR record to map an IP address to a hostname, if one has been published.Forward vs reverse DNSForward DNS starts with a…
DNS A vs AAAA vs CNAME: What Is the Difference?
Quick answer: A records map a hostname to an IPv4 address, AAAA records map it to IPv6, and CNAME records create an alias to another hostname.A and AAAA…