An HTTP check from Bulgaria sends a full GET request from our Sofia node, recording status code, response size, and total response time including DNS resolution, TCP connect, TLS handshake, and server response. Bulgaria has around 5.5 million internet users. For services targeting the Balkans, checking HTTP performance from Sofia gives a concrete data point for what users in the region actually experience.

CDN coverage of Bulgaria is less dense than in Western Europe. Major CDN providers — Cloudflare, Akamai, Fastly — have edge nodes in Sofia or close enough that most requests stay regional, but smaller CDN operators may not cover Bulgaria well and route Sofia users to Frankfurt or Amsterdam edges. If your service depends on a CDN and you see slower HTTP responses from Sofia than from Western European probes, the first thing to check is which CDN edge node is being selected for Sofia-sourced requests.

A slow HTTP response from Bulgaria with fast results from Germany points to origin distance or CDN edge selection as the cause. A non-200 status code only from Bulgaria — particularly a 451 (legal block) or 403 — suggests geo-restriction. Some services apply EU vs. non-EU routing logic that treats Bulgaria differently from Germany or France despite Bulgaria being an EU member since 2007. If you see unexpected behavior from our Sofia probe but not from other EU probes, verify that your WAF or CDN origin rules correctly identify Bulgarian IP space as EU.

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.