New Domain Extensions: .ai, .io, .dev & More Guide

The domain landscape has transformed since ICANN opened the gates to new generic top-level domains (gTLDs) in 2012. Today, over 1,200 extensions are available — from .ai and .io for tech companies to .shop and .store for e-commerce. But more choice does not always mean better choice. Most new extensions have failed to gain traction, while a select few have become legitimate alternatives to .com.

This guide analyzes the extensions that actually matter in 2026 — the ones being adopted by real companies, recognized by consumers, and valued in the domain aftermarket. We will separate the winners from the noise and help you choose the right extension for your project.

.ai is technically the country-code TLD of Anguilla, a small Caribbean island. But in 2026, it is the de facto extension for artificial intelligence companies. The AI boom turned .ai from an obscure ccTLD into one of the most valuable domain extensions, generating over $100 million in annual registration revenue for the tiny island nation.

Major AI companies using .ai: Stability.ai, Character.ai, Perplexity.ai, and hundreds of funded startups. The extension immediately signals "AI company" to investors, customers, and the tech press. .ai domains also command strong aftermarket prices — premium single-word .ai domains sell for $10,000-$500,000.

The downside: high registration costs ($70-100/year) and renewal risk (Anguilla could change pricing or policies). For AI-focused companies, the branding value justifies the cost. For others, a .com with "ai" in the name (like jasper.com) achieves similar branding without the ccTLD risk.

.io (British Indian Ocean Territory) became synonymous with technology and startups thanks to its association with "input/output" in computing. Thousands of tech companies use .io: GitHub Pages, CodePen.io, and countless SaaS products launched on .io domains before upgrading to .com.

In the tech startup ecosystem, .io carries genuine credibility. Investors, developers, and tech-savvy consumers recognize it as a legitimate business domain. Average aftermarket prices for quality .io domains range from $1,000-$20,000.

The uncertainty: .io's future is politically complex. The British Indian Ocean Territory may eventually be returned to Mauritius, which could affect the ccTLD's governance. While an immediate shutdown is unlikely, this geopolitical risk is worth considering for long-term brand building. See our SEO domain guide for TLD-specific ranking considerations.

.dev is a Google-operated TLD launched in 2019. It requires HTTPS (HSTS preloaded), which means every .dev site is automatically secure. Google uses web.dev for its developer documentation, giving the extension implicit endorsement.

At $12-15/year, .dev is affordable and specific. It works well for developer portfolios, open-source projects, and dev tool companies. The mandatory HTTPS requirement is a security advantage, not a limitation — you should use HTTPS on any domain anyway.

.dev has not achieved the same mainstream recognition as .io or .ai outside of developer circles. For developer-facing products, it is an excellent choice. For consumer-facing businesses, stick with .com or .co.

.co (Colombia's ccTLD, marketed as "company" or "corporation") is the most widely recognized alternative to .com. Companies like Twitter (t.co), Google (g.co), and Overstock (o.co) use .co as their URL shortener or primary domain. .co domains are available at $10-25/year.

The risk: users frequently mistype .co as .com and end up on a different site. If your .co domain's .com equivalent belongs to a competitor, you will lose traffic and brand confusion will be constant. Before registering a .co, check who owns the .com version. If it is a direct competitor or a large brand, choose a different name entirely.