How do I programmatically find the list of subnets?

what do you need the list for? the CMC has a public query method to get default subnets (I’m not sure what default subnets are… maybe the ones new canisters would be on at random if no additional conditions apply?) https://dashboard.internetcomputer.org/canister/rkp4c-7iaaa-aaaaa-aaaca-cai

here is how ic-admin gets it from the registry canister: https://sourcegraph.com/github.com/dfinity/ic/-/blob/rs/registry/admin/src/main.rs?L3745

Thanks @YAP . Those don’t seem to be functions exposed in public crates, so I’m not sure if everything would need to be copied. :thinking: PS: Not an urgent question, it can definitely wait until working hours.

Ah, that’s nice! I also noticed it, but like you, I was confused about what ‘default’ means. If that’s the public list, that should work. Thanks!

[image] YAP: I’m not sure what default subnets are… maybe the ones new canisters would be on at random if no additional conditions apply Yes, that’s exactly what it is. You can see that the output matches what has been defined in the latest proposal .

I’m still a bit unsure about what ‘default’ means. I wanted to add it to DFINITY’s ic-js , but I’m not sure how I should document it. The Rust code is also undocumented. What could be an accurate description for it? dfinity/ic/blob/23dcbd0ebfa0a6484b4e287823937034dbee85a6/rs/nns/cmc/src/main…

Thanks, now I understand how “default” is used. But is it safe to say that “default” equals the “public” subnets (as in the proposal shared above)? Or are the “default” subnets a subset of the “public” subnets?

In code and proposal public == default is valid. IMO it would be more correct to also include the ones publicly accessible by specifying a subnet type, but oh well…

[image] Vivienne: In code and proposal public == default is valid. I’m not entirely I get everything but, it answered my questions. Gonna work with the default. Thanks for the explanation!

List subnets programmatically

Developers

stefan.schneider October 13, 2024, 12:44pm 8

Maybe this explanation by Severin helps: NNS Updates Dec 1, 2023 - #8 by Severin

Topic		Replies	Views
List all canisters Getting Started	34	4204	April 10, 2024
How to get all subnets id and subnet details by HTTPS Interface? Developers	0	309	January 20, 2022
Finding out a canister's subnet Command Line Tools	6	683	November 10, 2022
Subnet topology Developers	4	115	October 28, 2025
Canister does not consume cycles (local) Developers nns	29	1561	September 14, 2023

List subnets programmatically

Related topics