Depth resolution: DNS log role in the network

DNS (Domain Name System) is an Internet telephone book. It gives human readable domain names (e.g., tools.kilocell.xyz) is converted to a computer-identifiable IP address. DNS when you enter a web site in a browser The query is the first step that has occurred.

Common DNS record type and its use

A Record (Address): The most basic record, pointing the domain name to an IPv4 address.
AAAA Records: Points the domain name to an IPv6 address, which is a standard for the next generation of Internet.
CNAME (Canonical Name)： An alias record allows the identification of one domain name to another. is often used for CDN acceleration or third-party service access.
MX (Mail Exchanger)： The mail exchange record defines the server responsible for receiving the domain name e-mail.
TXT (Text)： Text records, often used for title verification (e.g. Google Seach Console) and mail security protocols (e.g. SPF, DKIM).
NS (Name Server)： Domain name server records, specifying which DNS server to interpret the domain name.

How to solve the problem of domain name analysis?

Scene one: The website just changed the server, but it was still accessed by old content. This is usually due to the DNS cache. You can see **TTL (Time to Live)** Value, it determines the time the cache expires. You can try to refresh local DNS caches (e. g. run `ipconfig under Windows) /flushdns`）。

Scenario 2: Mail cannot be sent or marked as spam. Check your **MX record** correctly pointed to the mail server and ensure that **SPF (TXT record)** to prove that your server is authorized to send mail on behalf of a domain name.

Why select our DNS query tool?

Our tools are directly searched through the global DNS node of Cloudflare, with real-time, accurate results that are not subject to local operators DNS The effects of pollution. You can get the most specialized technical support here, whether you are a developer, a system administrator or a regular website owner.