RTM Networks Blog
Insights, guides, and market analysis on IPv4 addressing, network infrastructure, and IP management.
Leasing or Buying IPv4: How the Numbers Actually Compare
The lease-versus-buy decision usually gets framed as capital against operating cost. The figure that decides it for most organisations is the one neither column shows: the annual LIR fee.
Is the RIPE Waiting List Worth It? Running the Numbers
Joining the RIPE waiting list means paying LIR membership for as long as you queue, and the prize is a single /24. Here is when that maths works and when it does not.
Legacy IPv4 Space: What It Is and Why Buyers Pay More For It
Legacy blocks were handed out before the RIRs existed, and they sit under different rules than ordinary allocated space. Here is what that means in practice for buyers and holders.
IPv4 Exhaustion: What It Means for Your Business in 2026
The global IPv4 address pool has been exhausted for years. Here's what that means for businesses seeking IP address space and how to navigate the secondary market.
BYOIP: Using Your Own IPv4 Addresses with Cloud Providers
A practical guide to Bring Your Own IP (BYOIP) with AWS, Google Cloud, Azure, and other major cloud providers.
A Complete Guide to GRE Tunneling for IPv4 Routing
Learn how GRE tunnels work, when to use them, and how to configure them for routing leased or owned IPv4 address space through your infrastructure.
IP Reputation Management: Keeping Your Addresses Clean
Your IP address reputation directly impacts email deliverability, service availability, and business operations. Here's how to monitor and maintain it.
The Real Cost of Cloud IPv4: A BYOIP Guide for AWS, Azure and Google Cloud
Every major cloud now bills you by the hour for public IPv4 addresses. Here is what that actually adds up to, and how bringing your own space changes the arithmetic.
How Much Is My IPv4 Block Worth?
Price per address is not a single number. Six factors decide what a block actually fetches, and two of them can make an otherwise good block unsellable.
IPv4 Transfer Policy by Region: RIPE, ARIN and APNIC
Every registry allows IPv4 to change hands, and every registry does it differently. What each one asks for, how long it takes, and which transfers work across regions.
RPKI and ROAs: What Buyers and Lessees Actually Need to Do
Large parts of the internet now drop routes that fail RPKI validation. Here is what a ROA is, who creates it, and the two configuration mistakes that take a prefix offline.
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