Catchment observability for anycast operators
Your users in São Paulo may be landing in Frankfurt. Nothing in your monitoring would tell you.
You announce the prefix. BGP decides who lands where. anycast.dev measures which networks reach which of your nodes, IPv4 and IPv6 side by side, from thousands of vantage points worldwide, and shows you what changed and why.
No agent, no access to your systems. Measured from the outside, delivered in 7 days.
$ anycast-dev catchment diff --run 2026-08-21 --against 2026-08-14 --af 4
prefix country origin before after Δrtt
45.160.12.0/24 BR AS28573 GRU → FRA +138 ms
177.72.240.0/24 BR AS262589 GRU → FRA +141 ms
190.2.128.0/24 AR AS7303 GRU → FRA +152 ms
200.27.64.0/24 CL AS22047 GRU → FRA +167 ms
… 1,198 more
summary 1,204 /24s moved (3.1 % of catchment) · BR/AR/CL → FRA
trigger AS-path change via upstream AS3356, first seen 03:14 UTC
v6 unaffected — v6 catchment for BR still GRU
playbook prepend ×1 on FRA toward AS3356 · measured effect in 4/5 similar casesAnycast operators fly blind
Catchment drift
An upstream changes path selection and a whole region quietly lands on the wrong node, 50 to 150 ms slower. No alert fires. You hear about it from a customer, or never.
Wasted PoPs
A site attracts almost no traffic because BGP never sends anyone there. Capacity planning is guesswork without a catchment map.
IPv6 is a second, invisible network
The v4 and v6 catchments of the same service can look completely different. Almost nobody measures v6 separately. We always do.
Product 1 · available now
Anycast Health Check
2,500 € fixed price, excl. VAT · delivered in 7 days
- Catchment map of your anycast service, IPv4 and IPv6: which countries and ASNs reach which node
- Latency per region and per node, with the outliers named
- Consistency checks across nodes: SOA serial, NSID, v6 and TCP reachability
- Written report with prioritised BGP recommendations
- One follow-up call to walk through the findings
Measured from thousands of RIPE Atlas vantage points across the world's networks. Nothing to install. We need NSID or per-node hostnames enabled on your nameservers, that is all.
Product 2 · waitlist
Continuous external monitoring
from 99 € per month
Your nameservers measured around the clock from vantage points worldwide: latency per region, availability, answer correctness, and SOA serial drift between your nodes, the symptom of a broken zone transfer that nobody notices until a customer does.
No spam. One email when it launches, one when the price is final.
How we measure
From the outside: thousands of vantage points
We query your anycast address from RIPE Atlas probes across thousands of networks and record which node answers (NSID / hostname.bind), how fast, over v4 and v6. The result is a catchment map without touching your infrastructure. This is the method behind the Health Check and the monitoring service.
From the inside: the open-source agent
For continuous, prefix-level catchment maps we are building a small open-source agent that runs on your nodes (Verfploeter method, proven at B-Root and .nl). It aggregates dnstap metadata per minute and collects probe replies. Query names and full client addresses never leave your server. Code will be public, so you can read what leaves your network before you run it.
Correlated with public BGP data
Every shift is matched against RIPE RIS and RouteViews: which AS path changed, through which upstream, at what time. You get the cause in plain language, not a graph to interpret.
Recommendations with measured effect
Prepends and communities are tested on our own lab network and their catchment effect is measured. Recommendations come with an observed success rate, not a guess.
Measured by a network you can look up
anycast.dev is run on our own anycast infrastructure: a production network carrying our domains and a measurement lab with its own ASN and prefixes (ANYCAST-LAB, registration in progress). Every feature ships to our own network first.
Active measurements follow strict rate limits and a public opt-out. Method, probe addresses, abuse contact and opt-out live at anycast.org, the non-commercial side of this project.
Talk to a person
Questions, a network you want measured, or a partnership idea: hello@anycast.dev. Replies come from the engineer who does the measuring.