Available four chars domains:

As usual all of them were available at time of posting:

.com (12 domains):

B519.COM
B3RK.COM
B3AR.COM
B308.COM
B2TI.COM
B2C8.COM
AZS1.COM
AVZ1.COM
AUT9.COM
AU1O.COM
AT73.COM
AS47.COM

.net (4 domains):

B4AH.NET
B2B3.NET
ATHB.NET
AXIX.NET

.org (12 domains):

VAHM.ORG
UIOT.ORG
TLJS.ORG
TCTV.ORG
SULM.ORG
SGBK.ORG
SFTH.ORG
NBOE.ORG
LVRN.ORG
GWDG.ORG
GIVN.ORG
GATY.ORG