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IP Address Blocks ARIN Issues From

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ARIN allocates and assigns IP address blocks within its region from the following ranges. Information on all IP address blocks that IANA has assigned is available on the IANA website.

ARIN Internet Protocol Address Blocks
IPv4 Blocks IPv6 Blocks
CIDR Block Smallest Allocation IPv6 Allocation Blocks IPv6 Assignment Blocks
23.0.0.0/8 /22 2001:0400::/23 2620:0000::/23
24.0.0.0/8 /20 2001:1800::/23  
50.0.0.0/8 /20 2001:4800::/23  
63.0.0.0/8 /20 2600:0000::/12 ²  
64.0.0.0/8 /20 2610:0000::/23  
65.0.0.0/8 /20    
66.0.0.0/8 /20    
67.0.0.0/8 /20    
68.0.0.0/8 /20    
69.0.0.0/8 /20    
70.0.0.0/8 /20    
71.0.0.0/8 /20    
72.0.0.0/8 /20    
73.0.0.0/8 /20    
74.0.0.0/8 /22 ¹    
75.0.0.0/8 /20    
76.0.0.0/8 /20    
96.0.0.0/8 /20    
97.0.0.0/8 /20    
98.0.0.0/8 /20    
99.0.0.0/8 /20    
100.0.0.0/8 /22    
104.0.0.0/8 /20    
107.0.0.0/8 /20    
108.0.0.0/8 /20    
135.0.0.0/8 /20    
136.0.0.0/8 /20    
142.0.0.0/8 /20    
147.0.0.0/8 /20    
162.0.0.0/8 /22    
166.0.0.0/8 /20    
172.0.0.0/8 /20    
173.0.0.0/8 /20    
174.0.0.0/8 /20    
184.0.0.0/8 /20    
192.0.0.0/8 /24    
198.0.0.0/8 /24    
199.0.0.0/8 /24    
204.0.0.0/8 /24    
205.0.0.0/8 /24    
206.0.0.0/8 /24    
207.0.0.0/8 /24    
208.0.0.0/8 /22    
209.0.0.0/8 /22    
216.0.0.0/8 /22    

¹ As of October 2011, ARIN is issuing blocks of /22 and /21 out of 74.0.0.0/8, 199.0.0.0/8, 204.0.0.0/8, and 208.0.0.0/8. For more information, please see NRPM Section 4.2.2.2.

² ARIN is issuing IPv6 transitional technology blocks from 2602:0000::/16. For more information, please see NRPM Section 6.5.2.1.