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# rdns
Quickly look up reverse DNS names. One of them or lots of them.
Look them up by IPv4 address:
```sh
$ rdns 192.0.43.7
# 192.0.43.7
192.0.43.7 icann.org.
```
Look them up by IPv6 address:
```sh
$ rdns 2001:500:88:200::8
# 2001:500:88:200::8
2001:500:88:200::8 iana.org.
```
Look up ranges of them:
```sh
$ rdns 192.0.43.7/29
# 192.0.43.7/29
192.0.43.0 # error: lookup 192.0.43.0: nodename nor servname provided, or not known
192.0.43.1 43-1.any.icann.org.
192.0.43.2 43-2.any.icann.org.
192.0.43.3 43-3.any.icann.org.
192.0.43.4 43-4.any.icann.org.
192.0.43.5 43-5.any.icann.org.
192.0.43.6 43-6.any.icann.org.
192.0.43.7 icann.org.
```
Look them up by forward name:
```sh
$ rdns arin.net
# arin.net
2001:500:4:c000::43 www.arin.net.
2001:500:4:c000::44 www.arin.net.
199.43.0.43 www.arin.net.
199.43.0.44 www.arin.net.
```
Look them up by all of the above at once:
```sh
$ rdns 192.0.43.7 2001:500:88:200::8 192.0.43.7/29 arin.net
# 192.0.43.7
192.0.43.7 icann.org.
# 2001:500:88:200::8
2001:500:88:200::8 iana.org.
# 192.0.43.7/29
192.0.43.0 # error: lookup 192.0.43.0: nodename nor servname provided, or not known
192.0.43.1 43-1.any.icann.org.
192.0.43.2 43-2.any.icann.org.
192.0.43.3 43-3.any.icann.org.
192.0.43.4 43-4.any.icann.org.
192.0.43.5 43-5.any.icann.org.
192.0.43.6 43-6.any.icann.org.
192.0.43.7 icann.org.
# arin.net
2001:500:4:c000::43 www.arin.net.
2001:500:4:c000::44 www.arin.net.
199.43.0.43 www.arin.net.
199.43.0.44 www.arin.net.
```
Errors go to stderr so they're easy to filter out if you're scanning a sparse net and don't care about failures:
```sh
$ rdns 4.2.2.0/27 2>/dev/null
# 4.2.2.0/27
4.2.2.1 a.resolvers.level3.net.
4.2.2.2 b.resolvers.level3.net.
4.2.2.3 c.resolvers.level3.net.
4.2.2.4 d.resolvers.level3.net.
4.2.2.5 e.resolvers.level3.net.
4.2.2.6 f.resolvers.level3.net.
4.2.2.12 test-record.level3.net.
```
## Installation
```sh
$ go get -u doof.net/cmd/rdns
```
Happy resolving.
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