Is 21st.dev valid?

21st.dev is a valid domain that should be allowed to do sign-ups and registrations. Based on our analysis, you should allow this domain.

Raw API JSON response:

{
    "valid": true,
    "block": false,
    "disposable": false,
    "email_forwarder": false,
    "domain": "21st.dev",
    "text": "Looks okay",
    "reason": "Heuristics: WM1",
    "risk": 10,
    "mx_host": "alt4.aspmx.l.google.com",
    "possible_typo": [],
    "mx_ip": "192.178.163.27",
    "mx_info": "Using MX pointer aspmx.l.google.com from DNS with priority: 1",
    "last_changed_at": "2026-03-05T12:39:27+00:00"
}