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The (external) DNS server that is authoritative for your zone should host the PTR, if that is your ISP then yes. Otherwise maybe just wait until the record propagates or nslookup directly at the external DNS server with the type as PTR.
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The (external) DNS server that is authoritative for your zone should host the PTR, if that is your ISP then yes. Otherwise maybe just wait until the record propagates or nslookup directly at the external DNS server with the type as PTR.

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We have our own Windows Server 2008 external DNS server. The forward lookup is working fine but from the internet we are unable to resolve the reverse lookup.<br />
We have configured the PTR records on the external DNS server.<br />
<br />
Is there anything else I'm missing? Should the ISP host the reverse lookup? Need help. Thanks.
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We have our own Windows Server 2008 external DNS server. The forward lookup is working fine but from the internet we are unable to resolve the reverse lookup.
We have configured the PTR records on the external DNS server.

Is there anything else I'm missing? Should the ISP host the reverse lookup? Need help. Thanks.

DNS unable to resolve host from reverse lookup

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.