Resources
IP address space, explained
What each regional internet registry charges and allows, how transfers and waiting lists work, and the checks and tools around a block of addresses. Reference pages, each with the date it was last checked.
Registries
The three registries we work with
The RIPE NCC, ARIN and APNIC each set their own fees, waiting lists and transfer rules. One page for each, and one that compares them.
The RIPE NCC: fees, the waiting list and transfer rules
The registry for Europe, the Middle East and Central Asia: what membership costs in 2026 and 2027, how its IPv4 waiting list moves, and how transfers work.
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ARIN: fees, the waiting list and transfer rules
The registry for North America and parts of the Caribbean: its fees by holding size, a waiting list that moves each quarter, and needs-based transfers.
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APNIC: fees, IPv4 delegations and transfer rules
The registry for the Asia Pacific: its fees by formula in Australian dollars, the IPv4 it still delegates, up to a /23 per account, and how transfers work.
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The RIPE NCC, ARIN and APNIC compared
Fees, waiting lists, transfer policy, IPv6 and AS numbers at the three registries side by side, with what the smallest setup costs at each in 2026.
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Topics
Holding and running address space
What comes with a block once you have it: an AS number, IPv6, its place in the location databases, its reputation, its records, and how to move it or pay for it safely.
What is an ASN? Autonomous system numbers explained
What an autonomous system number identifies, how the numbers are laid out, which ranges are reserved, and how each registry hands them out and charges for them.
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IPv4 and IPv6: the differences that matter
How IPv4 and IPv6 differ in addresses, setup and routing, what the registries hand out of each and at what cost, how far IPv6 has spread, and why to run both.
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IP geolocation: how the databases work, and how to correct them
Where location databases get their data, the geofeed rules of RFC 8805 and RFC 9632, how to publish one at each registry, and how to correct a moved block.
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Readdressing: when IP addresses have to change, and how a lease avoids it
Readdressing moves a network to new IP addresses. When it happens, what it touches, how to plan it, and what a lease must say so it is never forced on you.
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IP blacklisting: which lists matter, how delisting works and what it costs
What gets an IP address or a whole range blocklisted, which lists matter in 2026, how delisting works and what it costs, and how often to check a block.
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IPAM: keeping track of your IP address space
What IP address management does, how it relates to the registry's records, the tools in 2026, and what to record when you lease or buy a block.
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Escrow for IPv4 transfers: how it works, and services you can use
How an escrow fits an IPv4 purchase step by step, what it protects and what it does not, and twelve escrow services and accounts a buyer can use.
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Contact
A question about your own case?
Tell us what you need to hold, move or route, and we will tell you how it works at your registry and what it costs. We usually reply in 1-3 business hours.
Services
Related services
Other ways we help with IPv4 address space.
Buy IPv4
Purchase IPv4 address blocks outright
Lease IPv4
Rent IPv4 addresses on flexible terms
PI & ASN sponsorship
Sponsoring LIR for PI, legacy and ASN
Further reading
Leasing or buying IPv4: how the numbers actually compare
Lease or buy is usually framed as capital against cost. What decides it is the block: PA needs LIR membership, and PI cannot go to your customers.
Read more