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DNS knowledge base

DNS records and problems

View explanations, setup guides and solutions for DNS problems.

DNS and domainsWhat is an A record?An A record links a host name to an IPv4 address.DNS and domainsWhat is an AAAA record?An AAAA record links a host name to an IPv6 address.DNS and domainsWhat is a CNAME record?A CNAME record points one host name to another host name.DNS and domainsWhat is an MX record?An MX record determines which mail server receives email for your domain.DNS and domainsWhat is a TXT record?A TXT record stores text information in DNS.DNS and domainsWhat is an SPF record?SPF identifies which servers may send email on behalf of your domain.DNS and domainsWhat is a DKIM record?DKIM publishes the key used to verify email signatures.DNS and domainsWhat is a DMARC record?DMARC determines how recipients handle failed SPF and DKIM checks.DNS and domainsWhat is an NS record?NS records identify the name servers that are authoritative for a DNS zone.DNS and domainsWhat is a CAA record?A CAA record determines which certificate authorities may issue SSL certificates.DNS and domainsWhat is an SRV record?An SRV record describes the location, port and priority of a network service.DNS and domainsWhat is a PTR record?A PTR record maps an IP address back to a host name.DNS and domainsAdd an A record through the customer panelLearn how to configure an A record to point a website or subdomain to an IPv4 address.DNS and domainsAdd an AAAA record through the customer panelLearn how to configure an AAAA record to point a website or subdomain to an IPv6 address.DNS and domainsAdd a CNAME record through the customer panelLearn how to configure a CNAME record as an alias to another host name.DNS and domainsAdd an MX record through the customer panelLearn how to configure an MX record to direct incoming email to a mail server.DNS and domainsAdd a TXT record through the customer panelLearn how to configure a TXT record for verification or policy information.DNS and domainsAdd an SPF record through the customer panelLearn how to configure a TXT record with authorised sending servers.DNS and domainsAdd a DKIM record through the customer panelLearn how to configure a TXT record for email signature verification.DNS and domainsAdd a DMARC record through the customer panelLearn how to configure a TXT record for email authentication reporting and policy.DNS and domainsAdd a CAA record through the customer panelLearn how to configure a CAA record to restrict which certificate authority may issue certificates.DNS and domainsAdd an SRV record through the customer panelLearn how to configure an SRV record to publish a network service.DNS and domainsAdd a wildcard DNS recordLearn how to configure an A or CNAME record to catch all non-existent subdomains.DNS and domainsPoint a subdomain to an external IP addressLearn how to configure an A or AAAA record to point a subdomain to another server.DNS and domainsWhy does DNS propagation take so long?Resolvers temporarily retain DNS responses according to the TTL. As a result, a change may not be visible everywhere immediately.DNS and domainsWebsite still points to the old IP addressAn old DNS cache, local hosts file or proxy may still point to the previous address.DNS and domainsEmail does not work after a DNS changeIncorrect or duplicate MX, SPF, DKIM or DMARC records can cause email problems.DNS and domainsCheck an SPF recordCheck that exactly one SPF policy exists and that it includes all legitimate sending servers.DNS and domainsCheck a DKIM recordCheck the selector, host name and public key when DKIM validation fails.DNS and domainsCheck a DMARC recordCheck that the record is located at _dmarc and contains a valid DMARC version and policy.