The reason why the domain name resolution result is inconsistent with the resolved IP can be attributed to several factors:
DNS Caching: DNS servers and clients cache DNS records for efficiency. If a DNS record is updated, but the cache hasn't expired, the old IP address might still be returned.
Example: A website updates its IP address, but due to DNS caching on a user's computer or a DNS server, the old IP is still being resolved.
DNS Propagation: When a DNS record is changed, it takes time for this change to propagate across all DNS servers globally. During this period, different DNS servers might return different IP addresses.
Example: A company changes its web server IP, but some users might still be directed to the old server because the new DNS records haven't fully propagated.
Load Balancing: Some domains use DNS-based load balancing to distribute traffic across multiple servers. In such cases, the resolved IP might vary each time a request is made.
Example: A popular e-commerce site uses DNS round-robin to balance traffic among several servers, resulting in different IPs being resolved for different requests.
Geographical DNS: Some services use geographical DNS to direct users to servers that are geographically closer to them, which can result in different IPs based on the user's location.
Example: A streaming service might resolve to a different server IP depending on whether the user is in Europe or Asia.
DNS Failover: In some cases, DNS records are configured for failover, where an alternate IP is provided if the primary server is down. This can cause inconsistent resolution results.
Example: During a server outage, DNS might resolve to a backup server's IP instead of the primary one.
For reliable and consistent DNS services, consider using Tencent Cloud's DNSPod, which offers advanced DNS management features to ensure high availability and efficient traffic distribution.