Learn Everything About IP Addresses
Reference articles on IPv4, subnetting, routing, and the IP address market. Sorted from introductory to advanced material.
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Essential concepts every beginner should understand
What is an IP Address?
Learn what IP addresses are and why every device on the internet needs one to communicate.
Read articleWhat is IPv4?
IPv4 is the addressing system that identifies devices on the public internet using 32-bit numeric addresses.
Read articleIPv4 vs IPv6
Compare the differences between IPv4 and IPv6 protocols and understand when to use each version.
Read articlePublic vs Private IP Addresses
Understand the difference between public and private IP addresses, when to use each, and how NAT bridges them.
Read articleStatic vs Dynamic IP Addresses
Compare static and dynamic IP addresses to understand which type your business needs.
Read articleWhat is a Subnet?
Master subnetting and CIDR notation to efficiently manage IP address ranges and network segments.
Read articleWhat is CIDR Notation?
Master CIDR (Classless Inter-Domain Routing) notation for efficient IP address allocation and network design.
Read articleWhat is NAT?
Learn how Network Address Translation (NAT) enables multiple devices to share a single public IP address.
Read articleTechnical Deep Dives
Advanced networking concepts for technical professionals
What is an ASN?
Learn about Autonomous System Numbers (ASN) and why they are essential for announcing IP addresses on the internet.
Read articleBGP & IP Routing
Learn how the Border Gateway Protocol (BGP) routes traffic across the internet and enables IP address announcements.
Read articleROA & RPKI
Understand Route Origin Authorization (ROA) and RPKI—the security systems that protect internet routing.
Read articleHow DNS Works with IP Addresses
Understand DNS resolution and how domain names map to IP addresses for internet connectivity.
Read articleReverse DNS & PTR Records
Learn about reverse DNS (rDNS) and PTR records—essential for email deliverability and server identification.
Read articleWhat is Anycast?
Learn how anycast routing enables global load distribution and DDoS protection by routing to the nearest server.
Read articleIP Geolocation Explained
Understand how IP geolocation works, its accuracy, and how it affects content delivery and compliance.
Read articleIP WHOIS Lookup Guide
Learn how to use WHOIS to look up IP address ownership, registration details, and contact information.
Read articleIP Market & Industry
Understanding the business side of IP addresses
IPv4 Address Exhaustion
Understand why IPv4 addresses ran out, what caused the shortage, and how the market has adapted.
Read articleWhat is IP Leasing?
Learn how IP leasing works, its benefits over purchasing, and when leasing makes sense for your business.
Read articleIPv4 Transfer Market Explained
Understand the IPv4 secondary market—how buying, selling, and leasing IP addresses works.
Read articleIPv4 Pricing Trends
Understand IPv4 address pricing—historical trends, current rates, and factors that affect IP address values.
Read articleWhat is RIPE NCC?
Understand Regional Internet Registries (RIRs), their role in IP allocation, and how RIPE NCC manages European IP resources.
Read articleWhat is ARIN?
Learn about ARIN, the Regional Internet Registry for North America, and how it manages IP address allocation.
Read articleWhat is APNIC?
Learn about APNIC, the Regional Internet Registry for Asia-Pacific, and its role in IP address management.
Read articleIP Reputation & Blacklists
Understand IP reputation, how blacklists work, and why clean IPs are essential for business.
Read articleBusiness & Use Cases
Practical guides for specific industries and applications
IP Addresses for Web Hosting
Learn how web hosting providers use IPv4 addresses and why clean IPs are essential for hosting success.
Read articleIP Addresses for VPN Services
Understand VPN provider IP requirements—geographic diversity, reputation, and scaling considerations.
Read articleIP Addresses for Gaming Servers
Learn about IP requirements for gaming servers—low latency, DDoS protection, and geographic distribution.
Read articleIP Addresses for CDN & Streaming
Understand CDN IP requirements—edge deployment, anycast, and high-bandwidth content delivery.
Read articleIP Address Monetization Guide
Learn how to monetize unused IPv4 addresses by leasing them to businesses through IP Market.
Read articleChoosing the Right IP Provider
Learn what to look for in an IPv4 leasing provider—reputation, support, pricing, and technical capabilities.
Read articleQuick CIDR Reference
Common subnet sizes at a glance
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