Issue title: Linking IPV4 Adresses
 Issue body: Hi, 
i can only link IPv4 with IPv6 adresses. We use the version 1.24 rev11
Is there any way to import a opportunity to link IPv4 with IPv4 adresses?

Best regards
Tehakla
 Comments: 
 Comment 0: Hi, sorry this is meant for dual-stacked hosts only.

You can however link addresses based on specified database fields, for example hostname ? Check under settings
```
Link addresses
Display linked addresses from another subnet if it matches selected field
```
 Comment 1: thank you for your fast answer :)
 Comment 2: Great. Reopen if you have any more questions.
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