Networking Carrier-Grade NAT vs Dedicated IPv4: ISP Cost Guide
CGNAT vs. dedicated IPv4 might be the single most expensive decision an ISP makes this decade. IPv4 has settled into…
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Networking 
Networking NAT64 and DNS64: Reducing IPv4 Demand in Mobile Networks
NAT64 and DNS64 have quietly become core pieces of infrastructure for mobile operators trying to loosen their grip on IPv4.…
Networking IPv4 Block Sizes Explained: When a /22 Beats a /24
Block size matters more than most people expect when buying IPv4. It decides how many usable addresses you actually get,…
Networking Test IPv4 Blocks for Blacklist History: Full Checklist
Before you test an IPv4 block for purchase, get one thing straight: blacklist history can make or break the deal.…
Networking IPv4 Block Migration: Re-IP a Data Center Without Downtime
IPv4 block migration means moving an entire data center or network estate from one range of addresses to another, and…
Networking IPv4 Reputation: How Block History Affects Email Deliverability
Nobody puts it on the invoice. But when organizations buy, sell, or lease IPv4 blocks, email deliverability is quietly one…
Networking Securing Your Border Router: Filtering Unwanted Announcements
Filtering announcements at your border router is one of the better defenses you have against route hijacking, accidental leaks, and…
Networking Reverse DNS PTR Records for IPv4 Blocks: Setup Guide
Ask anyone who has inherited a mail server with a broken PTR record, and they’ll tell you the same thing:…
Networking Spam Blocklists: The Hidden Risk in Used IPv4 Space
Spam blocklists may be the most overlooked risk in the IPv4 transfer market. And the most expensive to ignore. When…