I forgot how to do an inverse search to find my ASN in as-sets.

So Google AI tells me:

Yet:

hank@nocvm:~$ whois -h whois.ripe.net -i members as378
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

%ERROR:105: attribute is not searchable
%
% "members" is not an inverse searchable attribute.

%ERROR:101: no entries found
%
% No entries found in source RIPE.

% This query was served by the RIPE Database Query Service version 1.120 (DEXTER)

What am I doing wrong?

Thanks,

Hank