Hello, we started to validate (logging only) ASPA objects with this: if (aspa_check_downstream(at) = ASPA_INVALID) then { print "ASPA INVALID announcement (monitoring only): ", net, " AS path: ", bgp_path; } Example output: ASPA INVALID announcement: 91.223.183.0/24 AS path: (path 1764 5405 6830 206659 197477 215563) Then we manually investigate which AS along the path is responsible for the ASPA_INVALID result by asking routinator for the ASPA objects of all involved ASNs, example output for ASN6830 showing an AS0 ASPA: "aspas": [ { "customer": "AS6830", "providers": ["AS0"], "ta": "ripe" } ] Depending on the length of the AS path this is cumbersome. Is there a way to write the first responsible AS and ASPA object to the log that caused the ASPA_INVALID result? best regards, Christoph