Although admittedly not always user friendly, both UL and the FCC maintain publicly accessible databases so consumers can look up the numbers. They also have information on how to spot fake markings and/or what legit markings should look like.
Lacking the numbers doesn't by default mean the boards have issues, it just means the company didn't submit samples to UL/FCC get their products Certified safe and legal.
In the case if the FCC no Cert' for some kinds of products makes them illegal for use in the US.
As I understand it, OB Sound and LAN puts motherboards that have them in that category.
OTOH:
Certs mean it's been tested outside the company by a third party.
A UL Cert (primarily) tells you it isn't likely to catch fire. (Seems to be UL's main focus.)
The FCC Cert tells you it's not emitting excessive EMI that might affect your other computers, cards you've installed in it, nearby audio devices or even cell phones.
There are non-US Certs that tell basically the same thing things.
Example=
Korea Certification Standard Mark Requirements
Example=
EMC Requirements for Australia and New Zealand
It's only something I think about when dealing with small companies I've never heard of.
Major mobo/NIC/card/etc.. companies get the Certs by default. It's usually marked on the box and/or in the manual somewhere.
For them getting the Cert is cheap protection against lawsuits later on should a bum part slip past their own engineers.
Note: Product certs go to whoever applies for them. They -usually- ID the actual manufacturer, but not always.
Antec OEM's their PSUs from other companies (Seasonic, Delta, CWT, other?) and then (often/sometimes/used to ?) applies for Certification under their own name, so, by the UL marked on the part it looks like they are the actual manufacturer.
I don't know if they still do that but they were when CWT (who had a bad rep at the time) was one of their major suppliers.
Antec isn't the only company that has ever done that and it is unusual, but it happens.
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