Is c9.com valid?

c9.com 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,
    "domain": "c9.com",
    "base_domain": "c9.com",
    "text": "Looks okay",
    "reason": "none",
    "risk": 45,
    "is_disposable": false,
    "is_email_forwarder": false,
    "is_public_free": false,
    "is_public_premium": false,
    "is_business_provider": false,
    "is_isp_email": false,
    "is_email_api": false,
    "is_web_hosting_email": false,
    "is_self_hosted": false,
    "is_parked": false,
    "is_role_based_email": false,
    "mx_host": "c9.com",
    "mx_ip": "104.21.49.61",
    "mx_info": "No MX-pointer in DNS record. Using domain: c9.com",
    "mx_fallback": true,
    "mx_hosts": [],
    "mx_ips": [],
    "mx_priorities": [],
    "email_provider": null,
    "disposable_provider": null,
    "possible_typo": [],
    "domain_age_days": 10588,
    "domain_created_at": "1997-11-06T00:00:00+00:00",
    "block_status_changed_at": "2026-03-28T23:23:26+00:00"
}