Taiwan Network Information Center

The Taiwan Network Information Center (TWNIC) is a key organization responsible for the management and coordination of Taiwan's Internet Protocol (IP) address space and domain name system (DNS) infrastructure. Operating from its headquarters in Taiwan, TWNIC serves as the national internet registry, allocating IP address blocks to network operators within its region. A core public service it provides is the operation of a public DNS resolver, known as Quad101 (with the service IP 101.101.101.101), which offers recursive DNS resolution to users, enhancing privacy and performance compared to default ISP-provided resolvers. This service is part of TWNIC's broader mission to ensure the stable and secure operation of Taiwan's critical internet resources, supporting the local internet ecosystem, including internet service providers, enterprises, and individual users.

TWNIC's operational significance was highlighted by a significant security incident on May 8, 2019. During this event, its public DNS resolver service was disrupted by a Border Gateway Protocol (BGP) hijack. An unauthorized network entity, using the autonomous system number AS268869 based in Brazil, illegitimately advertised the IP prefix (101.101.101.0/24) assigned to TWNIC's Quad101 service. This malicious or erroneous route announcement caused global routers to redirect traffic intended for TWNIC's DNS resolver through the Brazilian network for approximately three and a half minutes. The incident created immediate risks of traffic interception, manipulation, or denial of service for users relying on that resolver. Although the brief duration limited widespread impact, the event underscored systemic vulnerabilities in the global routing system where improperly validated route announcements can propagate rapidly. It positioned TWNIC, through this real-world compromise of its infrastructure, as a case study in the fragility of internet core protocols and the potential for even well-established national resource operators to be affected by cross-border routing security failures.