Gain access to other types of DNS records. Get deep and accurate DNS data from our market-leading Internet infrastructure intelligence repositories.
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Explore DatabaseIntegrate our DNS Lookup API into existing systems and workflows to add essential context like IP addresses and MX, NS, and TXT records.
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Explore LookupRetrieve historical A/AAAA records for any FQDN with a forward search or list associated FQDNs for an IP with a reverse search using our API.
Explore APIFind all A/AAAA records historically linked to an FQDN or discover FQDNs that resolved to an IP address using our web tool.
Explore Lookup"我们希望为所有 Cyberscape 用户提供整合网络威胁调查相关数据的能力。WhoisXML API 所提供的独特数据将对网络威胁调查社区有所帮助，分析师可以缩短了解和缓解威胁的周期"。
"WhoisXML 改变了我们的游戏规则，可快速识别所有那些为网络犯罪分子提供物质支持的供应商，这些犯罪分子使用看似合法实则使用非常复杂的网站，从而彻底颠覆了我们在过程中侦破网络犯罪的能力。通过快速识别这些在不知情的情况下位犯罪分子提供支持的供应商，可协助其以公共利益为目的，摧毁犯罪分子的基础设施。”
An MX record or mail exchange record, is a type of DNS record that specifies which mail servers are responsible for accepting email messages for a domain. They are essential for email delivery, as they direct incoming emails to the correct servers depending on the email service provider (e.g., Google Workspace, Microsoft 365, Zoho Mail, etc.). A domain can have multiple MX records, each with a different “priority” value.
When an email is sent, the sender’s mail server doesn’t know where to deliver it, so it queries the DNS for the recipient’s domain name (e.g., gmail.com) to find its MX record. The authoritative DNS server for that domain responds with a list of designated mail servers, each accompanied by a numerical priority value.
The sending mail server then attempts to connect to the recipient's mail server with the lowest priority number first (actually the highest priority value). If the server is unavailable, it systematically tries the next lowest-priority server until a connection is established. This system of multiple records with priorities ensures that email can still be delivered even if one mail server is down.
Checking a domain’s MX record is essential because an MX record enables reliable email delivery. It helps detect and prevent misconfigurations that could prevent users from receiving emails.
The domain owner has control over MX records, but they are managed through interfaces provided by the DNS hosting service provider.
You may use DNS Lookup API or our lookup tool, which returns TXT, NS, and other DNS record types. If you only want to look up a specific record type, you can use these tools for free:
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