# Replit — Why We Built Our Own DNS Infrastructure

- Company: Replit (replit.com)
- Announced: 2021-04-29
- Category: infrastructure-release
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://replit.com/blog/dns
- Record: https://forck.live/items/18049-why-we-built-our-own-dns-infrastructure
- Subject: Replit Agent

Replit built its own authoritative DNS name server to route HTTP requests for *.repl.co domains to the correct cluster's proxy load balancer, enabling cluster-aware hosting without extra network hops. The DNS server, implemented in Go, also handles DNS-01 challenges for TLS certificates and uses low TTLs (60s) with tombstones to transparently migrate repls between clusters.

## Evidence

Verbatim from https://replit.com/blog/dns:

> after more thinking we had the wild idea of running our own authoritative DNS name server which handles DNS lookups for *.repl.co domains. It would respond with an A record with the IP address of the proxy load balancer in the correct cluster.

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Record: https://forck.live/items/18049-why-we-built-our-own-dns-infrastructure
Catalogue: https://forck.live/llms.txt
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