77 available four-chars domains

These were all available at time of posting too:

.com (37 domains):

cm06.com
dy-8.com
e4ss.com
a658.com
a2tn.com
8smt.com
88jz.com
6mdm.com
at4l.com
bd51.com
bk2m.com
bc-e.com
7rro.com
58ys.com
58wf.com
52ja.com
4wan.com
4ufg.com
59ce.com
57sm.com
5cmi.com
799y.com
686f.com
6e7e.com
5u5g.com
65fg.com
66po.com
5j82.com
5f58.com
1-iq.com
hy24.com
hqtf.com
hq-1.com
grf6.com
hr1z.com
io-o.com
ifjz.com

.net (33 domains):

cwmm.net
cu86.net
cnxj.net
eesg.net
gdjq.net
86bo.net
ahww.net
as-q.net
aa-d.net
c-br.net
c118.net
bzdz.net
bsyc.net
b0ng.net
axts.net
55wl.net
4khd.net
35yy.net
chbw.net
hyhb.net
hovb.net
hovc.net
hcfj.net
gl68.net
i-mi.net
i186.net
kmp4.net
khea.net
jnda.net
jh56.net
jcly.net
iwbo.net
dseo.net

.org (7 domains):

dcgz.org
cv64.org
ijtn.org
gghi.org
gfom.org
drsf.org
51bf.org