Available four chars domains starting with a number

0APY.ORG
10SO.NET
12AI.NET
138K.NET
22CF.COM
23KZ.COM
2BCP.COM
2D8U.COM
2D8U.NET
3ICN.NET
43TU.COM
45AB.COM
49EE.COM
4G4G.ORG
4LGN.COM
508Z.COM
50BO.COM
59I7.NET
5IFZ.COM
5IVK.NET
5M5Y.COM
5PSK.COM
5V-B.COM
73TU.COM
74TU.COM
75TU.COM
77A7.COM
77CF.COM
77S7.COM
7EEK.COM
7IFE.COM
7LMI.COM
7YEA.COM
8183.ORG
83TU.COM
9DMH.NET
9E56.COM
9RQN.COM
9Y00.COM