Search keys (Look-up Keys)
- person name, nic-hdl, e-mail
- role name, nic-hdl, e-mail
- maintainer maintainer name
- inetnum network number, network name
- domain domain name
- aut-num AS number
- as-macro AS-macro name
- route route value
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Network number and route value are classless
Network name is a search key, but not unique