IPv4 decision library
Research public and private IPv4, leasing and purchase choices, address reputation, RIR requirements, routing, RPKI, LOAs, and day-to-day network responsibilities.
What this library covers
Market context, commercial choices, registry readiness, and operational controls—without treating external approval, reputation, or availability as guaranteed.
177 published guides
Choose by task
Use the library for context, then continue to the product or operating workflow that matches your responsibility.
Start with: How to find my IPv4Model block size, term, setup, and operating assumptions before requesting capacity.
Search current public listings and review the evidence and responsibilities attached to each path.
Understand authority, routing, records, acceptance, abuse response, and renewal ownership.
Use practical guidance for RIR records, routing, RPKI, LOAs, reputation, and support workflows.
From the library
New and updated articles are ordered by publication date. Open the guide that matches your current question.
Latest guide
Learn what documents are needed for an IPv4 transfer. Use this buyer and seller checklist to prepare agreements, authorization records, registry forms, and more.
NAS is Network Attached Storage that centralises files for a whole network. Learn how it works, how it compares to SAN and cloud, and how remote access works.
Learn what a botnet is, how compromised hosts are recruited and controlled, what botnets are used for, and how botnet activity damages your IPv4 reputation.
Learn what network abuse is, how abuse reports reach your abuse contact, how to handle them properly, and who is responsible for abuse on leased IPv4 space.
Learn what happens to WHOIS, RDAP, RPKI, IRR, reverse DNS, BGP, geolocation, and reputation records after an IPv4 address transfer.
Learn what a Letter of Authorization (LOA) is, how it differs from a ROA, who can issue one, and what to verify before leasing IPv4 so you can actually route it.
How to size IPv4: what /24, /23, /22, /21, /20 mean, how many addresses your services need, growth headroom, and whether to lease or buy the block.
Datacenter vs residential IP addresses explained: how they differ, how systems detect them, why they're treated differently, and which your infrastructure needs.
Explore how differences in RIR transfer policies affect IPv4 transactions, market liquidity, compliance requirements, and cross-region address transfers.
Proxy vs VPN explained: how they differ in encryption, scope, and speed — plus why the IP addresses behind them decide which one actually works for you.
Learn what CGNAT is, why ISPs use it, what it breaks port forwarding, gaming, hosting, VPN and how businesses get real public IPv4.
Learn what RPKI and ROAs are, how route origin validation protects IPv4 prefixes from hijacks, common ROA mistakes, and who creates ROAs for leased IP space.
