dns ptr record

This morning the bean accidentally found that the company's DNS server above only the forward parsing, and there is no corresponding PTR record. In other words, the IP address can be resolved by the domain name, but the reverse IP address is not able to find the domain name.1 hours wrote a very simple script, to determine whether there are existing records of the

1) in the Windows system click "start" menu → "run" → "input cmd" (Windows 98 system is command), open the windows system MS-DOS interface. Enter the "NSlookup" command to go to the domain name resolution interface. 2) Enter "set q = mx" and press enter to enter the MX record query status.Enter the main domain name of your company's email server, that is, the part after the "@" of the user's email addressFor example: 163.com, china.com, etc.This d

Spam in the flood of today, spam to our lives, work, learning has brought great harm. Because of the lack of effective authentication mechanism between SMTP servers, even if the use of spam identification blocking technology is still common, and the spam identification and blocking technology is mainly in the receipt of letters according to a certain condition to identify, the need to consume a large number of server resources, if the letter to the server before the adoption of a , this will gre

Ext: http://www.cnblogs.com/zcy_soft/archive/2013/09/23/3335235.html DNS a record NS record MX record CNAME record txt record TTL value PTR valueConstruction Station noun Explanation:

DNS Services : is the domain name resolution, such as itbdw.tk is only a domain name, the actual access to the IP address, we enter the domain name, and then through the DNS server resolution to the corresponding IP, you can visit the site. a record : Each host on the Internet has an IP address and has 4 sets of numbers. These numbers are used. Separate, for exa

Each entry in a database is called a resource record (RR) Resource record format: The second field in the first section, the third field, the fourth field (resource record type), and the fifth field Name TTL in (Internet) rrtvalue If TTL is not written, you must specify a default value in the global variable. The TTL value can be omitted. TTL 600; For exampl

Problem phenomenon:AD The domain controller operating system is WIN2008R2, and a rejected error occurs when a DNS host (A) or alias (CNAME) record is manually added in DNS Manager. However, after you join the client to the domain, you can see the DNS host (A) record for the

1. Because of the design requirements of Exchange 2010, we need to add the relevant DNS records and add the following records: Automatic discovery is an automatic Outlook feature provided by Exchange 2007 and above, and if your Outlook is above the 2007 SP2 version, you can enjoy the flexibility that automatic discovery brings to your machine. So we add a Autodiscover record here: Autodiscover.xxx.xxx CAS

=" Wkiol1m8g3hz_nvyaaauy6nb98e649.png "/>DNS distributed features650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M02/06/B1/wKiom1m8hFugm-2WAAB00Pw_cHk501.png "title=" Qq20170916095350.png "alt=" Wkiom1m8hfugm-2waab00pw_chk501.png "/> Zone Resolution Library: Made up of a number of RRsRR: resource record type Resource Record details the relationship of a

About the dns resolution and mx record of the email server! How do I make MX resolution records for domain names? --------------------------------------------------------------------------------Most SMTP requests an MX record to point to a host name. Therefore, specify an MX

The DNS record disappears! Don't be confused. It's not so terrible. The first thing you need to do is to find the invisible DNS records (as described above). Now you have calmed down, let's take a look at how to fix the DNS records that disappear! Fix "corrupted" or wrong DNS