About NexSub

A free subdomain service by OpenSource Hub — built for developers, by developers.

What is NexSub?

NexSub lets you claim a free subdomain on multiple domains — nexsub.online, mydemodomain.buzz, demoinstance.online — and manage its DNS records in full. No payment required, no time limit, no ads.

Whether you're running a side project, testing a deployment, or need a quick hostname for your homelab, NexSub gets you online in under a minute.

Built by OpenSource Hub

OpenSource Hub is a creative software studio focused on developer tools, open-source projects, and community services. We believe great infrastructure should be accessible to everyone.

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Available Domains

NexSub (default)

.nexsub.online

default

MyDemoDomain

.mydemodomain.buzz

DemoInstance

.demoinstance.online

Technical Stack

Backend

PHP 8.2+, MySQL/MariaDB

DNS API

Spaceship Registrar API

Frontend

System fonts, Font Awesome 6

Security

CSRF, bcrypt, parameterized queries

Start using NexSub today

Free, instant, no credit card required. Claim your subdomain in seconds.

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