PS:我用的是EditDNS Lifttime帐号。

* Free DNS Hosting
Easy, web-based interface for adding/modifying/deleting records for your domain name. We support A, CNAME, MX, NS, TXT, PTR, and AAAA records.
* Free Backup DNS
Allow us to run as a secondary nameserver for your domain. We will automatically grab your records from your master nameserver.
* Free Dynamic DNS
Do you have a dynamic IP from your cable or DSL company? You can automatically update your IP address for your domain as soon as it changes.
* Free Sub Domains
Want your own unique name on the internet but don't feel like registering a domain name? Create your own hostname from a domain name we own.
* Free Web Forwarding
Do you have a long website name and always forget it? We will forward your domain to any other website, we can even hide (cloak) your forwarded URL for you.
* Free E-Mail Forwarding
Do you already have an e-mail address and want to forward your domain's email to that address? Use our email forwarding services to automatically forward your domain's email for you.
* Free E-Mail Hosting (With spam filtering!)
Do you only need email hosting for a domain? Don't pay a company for a hosting account, use our free email hosting services that allow you to check your email via POP3 and/or Webmail.
* Free E-Mail Backup (With spam filtering!)
Scared you're going to miss important emails? If your email server is offline, we will store your email for up to 30 days and re-send it to you when your email server comes back up. You will never miss another email again.

使用ns1.boxup.org代替ns1.xinnet.com？
付费用户做得到
http://support.nerdie.net/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=36&group=EditDNS

DNSstuff的Timing测试结果
Searching for boxup.org A record at l.root-servers.net Got referral to TLD6.ULTRADNS.CO.UK. [took 119 ms]
Searching for boxup.org A record at TLD6.ULTRADNS.CO.UK. Got referral to ns3.boxup.org. [took 25 ms]
Searching for boxup.org A record at ns3.boxup.org. Reports an answer.

Record is:

Looking up at ns3.boxup.org.... Reports 1 A record(s). 32ms.
Looking up at ns2.boxup.org.... Reports 1 A record(s). 52ms.
Looking up at ns1.boxup.org.... Reports 1 A record(s). 27ms.

Average of all 3 nameservers: 37ms (plus 144ms overhead).

Score: A+

Took off 3 points for ".org" TLD (extra lookups may be required to find the parent servers).
Note: The 144ms overhead is the time it takes to get your NS records from the parent servers, and indicates a worst-case scenario (normally, the resolving DNS server would have the common parent server entries cached, and would know the parent server(s) that were responding most quickly).
The best times since the last time this web server was last restarted are: 3ms average response, plus 11ms overhead.
Note that these times are from a server located in the United States; if most of the people using your DNS are outside of the United States, your actual results may be better than what is shown here.
A rating of 'B' or higher is generally good (this tool is very picky!). This tool is designed to make an educated guess about speed, and to point out potential factors that may reduce the DNS speed, and it is not perfect.