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Wez Furlong
31 lines
746 B
Markdown
31 lines
746 B
Markdown
# ptr_host
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```lua
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local domain = kumo.dns.ptr_host(IP)
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```
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{{since('2025.12.02-67ee9e96')}}
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Given an IP address in either V4 or V6 format as the input, returns
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the reversed address plus appropriate top level domain suitable for
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performing a reverse lookup.
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This function is purely local string manipulation; no actual DNS queries are
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performed.
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You will typically use [lookup_ptr](lookup_ptr.md) to perform an actual PTR
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lookup; this function is a utility function for the cases where you're doing
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something unusual.
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```lua
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print(kumo.dns.ptr_host '127.0.0.1')
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-- prints out:
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-- 1.0.0.127.in-addr.arpa
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```
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```lua
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print(kumo.dns.ptr_host '::1')
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-- prints out:
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-- 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa
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```
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