uri schemes that we want numbers for

Collect uri-schemes here

Sorted by likely encoding we want to go for

Likely 1+0 (24)

URI scheme	CRI value	Reference
coap	-1	[RFCthis]
coaps	-2	[RFCthis]
http	-3	[RFCthis]
https	-4	[RFCthis]
urn	-5	[RFCthis]
did	-6	[RFCthis]
coap+tcp	-7	[RFCthis]
coaps+tcp	-8	[RFCthis]
coap+ws	-9	[RFCthis]
coaps+ws	-10	[RFCthis]

14 slots left.

Note that MQTT:// (and possibly MQTTS:// ???) are not in here as these are not registered at all, so these numbers can be registered with the url-scheme registration.

Likely 1+1 (232)

(There was an entry for http here -- for consistency, we put this into the 1+0 group.)

1+2 (many)

Further references

Bluetooth SIG did this exercise already at https://www.bluetooth.com/wp-content/uploads/2022/11/assigned_numbers_release-1.pdf#page=35 -- but with no priorities in assigning numeric ranges.