The Advanced DNS Settings / DNS Manager page in SiteControl is a tool that visualizes all your domain's DNS records and allows for additions or modifications to your current list of DNS records. The majority of users will never need to edit or even view the DNS records. Use the tool only if you need to create new custom DNS records, redirect existing DNS records to third-party destinations, or modify existing mail exchanger (MX) records to point them to a third-party email service provider.
If your domain name points to our name servers, then you can use the Advanced DNS Settings tool. If not, contact your name server provider for assistance with any DNS records changes.
This article contains the following sections:
- View current DNS records
- DNS Record Types and Usage Explained
- Add new DNS records
- Edit existing DNS records
I. View current DNS records:
1. Log into your Comcast account with your username and password (click on Log In on the top right corner of the page). Once logged in click on the tile on the top left corner (right next to the Marketplace menu), then select the Websites tile application (or select Comcast Business Domain and Email) to reach our SiteControl.
2. On the Home page click on Domain Name.
3. The Domain Names page will show a list of your active domain names. Click Edit right next to the domain name you want to view the DNS records for.
4. At the bottom of the domain Summary page, click Advanced DNS Settings.
The sample below shows our default DNS records of a domain name pointed to Web Hosting, Email Services, and the default NameServer records:
II. DNS Record Types and Usage Explained:
1. Type A (Address Mapping) records, marked in red color in the sample above, and specify the IP address (IPv4) of your Web Hosting Services. Please note that you have your own hosting IP address, different from the one shown in the sample.
2. A Canonical Name or CNAME record is a type of DNS record that maps an alias name to a true or canonical domain name.
3. Type MX (Mail exchanger) record, marked in blue color, specifies your mail exchange server, and it is responsible for your Email Services. Typically, there is more than one MX record and each of them has a priority value. A lower priority number indicates a higher priority MX record.
4. Type Name Server (NS) record, marked in brown color, specifies the authoritative name servers for your domain name.
Important Note: Changing Comcast default adns.cs.siteprotect.com and bdns.cs.siteprotect.com name server (NS) records in your DNS zone file will NOT change the authoritative name servers of your domain name. For instructions on how to change authoritative name servers of a domain name registered with us, see the How do I change my nameservers? article.
III. Add new DNS records:
1. Follow the instructions in Section I: View current DNS records of this article to access the DNS Manager tool. If you have multiple domain names under your account, make sure to select the correct one using the Edit DNS Zone for drop-down menu.
2. Use the drop-down menu of the Add a New Resource Record section and select the type of the record you wish to add: A, CNAME, NS, TXT or SPF. If you need to add an MX record, then use the pre-selected field that has a Type - MX.
3. In the Source field, enter the name of the record (e.g.: example.com, www.example.com, ftp.example.com, mail.example.com, imap.example.com).
Note: The “@”symbol symbol is not accepted by our tool as a valid source. Thus, make sure to replace it with the actual domain name (e.g.: example.com)
4. In the Destination field, enter the location to which the new record will point:
a. If you selected type A, then the destination must be an IP address.
b. If you selected type CNAME, then the destination must point to a domain name or hostname.
c. If you selected type MX, then the destination must point to the hostname of the email service provider.
d. If you selected type TXT, then the destination value can be free form text data of any type.
e. If you selected type SPF, then the destination must contain properly configured SPF record value which starts with “v=spf1”.
5. Finally, click Add Now.
IV. Edit existing DNS records:
Keep in mind that there is a propagation time when DNS changes are made. Typically, the propagation time takes a few minutes for DNS changes to update across the Internet's DNS system, however it can occasionally take longer (4-6 hours) for a change to take effect.
1. Follow the instructions in Section I: View current DNS records of this article to access the DNS Manager tool. If you have multiple domain names under your account, make sure to select the correct one using the Edit DNS Zone for drop-down menu.
2. In the Current Resource Record(s) section, you can choose to change the name of either the Source or the Destination of an existing record.
3. Click the Update button next to the appropriate Destination field.
Note: Before you update an existing DNS record, it is recommended to lower the Time To Live (TTL) value to 300 seconds (5 minutes). This way the DNS propagation time will be shorter.
4. If you need to delete a record, click Delete next to the appropriate Destination field.