A DNS check from Bulgaria queries your domain's authoritative nameservers directly from our Sofia node and records what is returned. This verifies DNS propagation has reached Bulgarian infrastructure after a record change, or confirms that your GeoDNS policy is returning the correct record for Bulgarian users. The probe queries authoritative servers directly, bypassing any recursive resolver cache, so it reflects the current authoritative record.

Bulgarian ISPs run their own recursive resolvers and many users also use public resolvers like Cloudflare (1.1.1.1) or Google (8.8.8.8). If you use GeoDNS and want to verify which record Bulgarian users receive, our Sofia probe shows what an authoritative query from the AS211507 IP range returns. Bulgaria is sometimes mapped to a southeastern EU or Balkan regional zone in GeoDNS systems, which may mean Bulgarian users receive a different record than German or French users even if you intend them to share the same EU response.

DNS propagation in Bulgaria follows standard TTL behavior. If a DNS check from Sofia returns a stale record after your TTL has expired, the authoritative nameserver is the first place to investigate rather than Bulgarian resolvers. Cross-check the same domain from Germany and Romania: if all three return the old record, the nameserver sync has not completed. If only the Sofia probe returns the old record, it is possible a Bulgarian recursive resolver is still caching the old entry — though this is uncommon if the TTL has genuinely expired.

Sofia is the center of Bulgarian internet infrastructure. BIX (Bulgarian Internet Exchange) is the country's primary neutral IX, connecting Bulgarian ISPs, hosting providers, and content networks in Sofia. BIX carries significant regional traffic and is the main peering point for keeping domestic Bulgarian traffic from transiting out of the country. Equinix also operates a colocation facility in Sofia, which added a second neutral peering point and brought international carrier presence directly into the Bulgarian market.

Bulgaria has been an EU member since 2007, and EU investment has helped modernize parts of its broadband infrastructure. Fiber penetration in Sofia and other major cities is solid, though rural coverage remains uneven. The major fixed ISPs are Vivacom (AS8866), A1 Bulgaria (AS6802), and Bulsatcom (AS34224). Vivacom operates the largest national backbone and provides significant transit capacity. Telus International Bulgaria (formerly TTEC) and other technology companies have large operations in Sofia, creating steady demand for quality datacenter connectivity.

Telehouse Sofia is the primary carrier-neutral datacenter in the country and the most connected facility in Bulgaria. It hosts BIX and a large number of ISP and hosting provider PoPs. Sofia's geographic position gives it natural routing relevance for traffic between Western Europe and Turkey, Greece, and the Middle East — paths that transit the Balkans must pass close to Sofia regardless of direction. Several Tier-1 and Tier-2 transit providers maintain Sofia PoPs specifically for this transit role.

Latency from Sofia to other regional cities: Bucharest is around 15 ms, Istanbul around 30 ms, Athens around 30–35 ms, Belgrade around 20 ms, and Frankfurt around 40–45 ms. These figures reflect the direct transit paths available from Sofia. Bulgaria is one of the lower-cost EU hosting jurisdictions, which has made it attractive for operators wanting EU-legal status for their infrastructure at lower colocation prices than Frankfurt or Amsterdam.

Our probe node is in Sofia, on AS211507 via Julian Achter (Aluy), colocated at Telehouse Sofia. This puts the probe in the best-connected facility in the country with access to BIX peering and multiple upstream transit providers. Tests from this node reflect conditions typical of Sofia-hosted services and are broadly representative of Bulgarian network performance. The Telehouse Sofia location means latency from the probe to BIX-connected networks is minimal.