ColoMap

ClouDNS (AS203391)

157 colocation facilities on-net · across 42 metros · Content platform

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ClouDNS (AS203391) is managed anycast DNS from a small Bulgarian company — Cloud DNS Ltd of Sofia, founded in 2010, certified to ISO 27001 and an accredited domain registrar since 2024 — serving over a million domains and, by its own figure, more than eight billion queries a day. Its entire routed footprint is twelve prefixes: eight IPv4 blocks and four IPv6 blocks. That is precisely the shape of an anycast DNS operator and nothing at all like the shape of a carrier.

That matters for how this page should be read. The buildings listed here are places a ClouDNS anycast node runs, generally on capacity rented from whoever operates the site, rather than places where a tenant can cross-connect to ClouDNS or buy anything from it — there is no transport product, no transit and no port to order. The interconnection that does exist is public peering at a handful of fabrics weighted towards Bulgaria and emerging markets, aimed squarely at operators running large recursive resolvers who want a shorter path to these authoritative nodes. For everyone else the service is reachable over any transit, from any building.

ClouDNS (AS203391) is on-net at 157 colocation facilities in the ColoMap directory.

Top metros where ClouDNS (AS203391) is reachable: Washington, DC, US, Frankfurt, DE, Santa Clara, CA, US, London, GB, Dallas, TX, US.

Use the directory below to find a facility on-net with ClouDNS (AS203391), or request a quote tailored to your connectivity requirements.

ClouDNS (AS203391) at a Glance

AS number AS203391
Network type Managed anycast DNS operator
Network scale Twelve prefixes in total, eight IPv4 and four IPv6, around 65 anycast points of presence claimed across six continents, over a million domains and a stated eight billion queries a day
Services Managed and anycast DNS DNS with attack protection geographic DNS steering secondary DNS DNSSEC DNS failover uptime monitoring domain registration TLS certificates email hosting
DDoS mitigation Bundled into the paid anycast tiers with no published filtering capacity
SLA Resolution availability marketed at 100%, backed by escalating service credits rather than a lower committed figure
Peering policy Open, no ratio requirement, no contract required, no location requirement
Also known as ClouDNS

Top metros where ClouDNS (AS203391) is on-net

Operators co-located with ClouDNS (AS203391)

  • Equinix 41
  • Digital Realty 33
  • CoreSite 7
  • DataBank 5
  • Gigahost AS 3
  • QTS Data Centers 3
  • 365 Data Centers 2
  • ColoCrossing 2

Facilities on-net with ClouDNS (AS203391)

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