IP Guides
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 Guides
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…
Network
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…
IP Guides
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…
DNS
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…
Network
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…
Network
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…
DNS
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…
DNS
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…