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ARIN
4 x /21 (possible to sub-divide)
1 x /22 (possible to sub-divide)
14 x /24
1 x /20
1 x /16 (possible to sub-divide)
RIPE
1 x /19
5 x /22 (3 x /22 possible to sub-divide)
2 x /23 (possible to sub-divide)
LACNIC
2x /18 (possible to sub-divide)
IPs4Transfer.com

Current IPv4 ranges for transfer