Field notes from the global routing layer
The asn.zone blog
Analyses, reports, and explainers on IPv4/IPv6 allocation, transfers, peering, and the operators behind them. Mostly slow takes - the data moves on monthly cadences anyway.
The 2026 IPv4 transfer market: who moved, what they moved, and where it ended up
We cross-referenced every 8.16 transfer in Q1 2026 with the post-transfer routing announcement. Three patterns emerge - and one of them is genuinely new.
Latest
7 postsCloudflare's IPv6 footprint, mapped: 47 announced /48s and 12 we couldn't trace back
A walk through every IPv6 prefix announced by AS13335, what they're used for, and the curious cluster that doesn't show up in any RDAP record.
Amazon picks up another /16 from a defunct ISP - full transfer chain
A 65,536-address block changed hands last week. We trace the resource from its 2003 allocation through six counterparties to its current home in AWS us-east-1.
Germany's allocation footprint in 2026: still RIPE's largest, still mostly Deutsche Telekom
A clean read on .de allocations, the ten largest holders, and how concentrated the IPv4 holding really is among the top of the long tail.
How we backfilled 80,491 organization names with one CAIDA dataset and a SQL window
The RIRs migrated to opaque hash org-IDs. Most public tools now show "ARIN 45fe880b…" - we got back to real names by leaning on a CAIDA dataset.
New endpoint: per-IP geolocation lookup with full delegation history
We've shipped a small but meaningful API: resolve any IPv4 or IPv6 address to its current registered holder, country, ASN, and the transfer chain that got it there.
AFRINIC's allocation pace in 2026 - slowest growth since 2019, and the long tail is shrinking
AFRINIC delegated fewer prefixes in Q1 than in any quarter since the runout era. We unpack what that means and which countries are most affected.
Get the monthly digest
One email per month - only the analyses worth your time. No tracking, no upsell, easy to unsubscribe.