Our 221-C Wireless access point is directly connected to an interface.   I split the IPv6 /67 subnet in half and created a /69 subnet.

IPv6
Status Available
Global Unicast IPv6 Address 2600:1702:980:25e0::1
Link-local IPv6 Address fe80::eea:c9ff:feb8:84e0
IPv6 Addressing Subnet (including length) 2600:1702:980:25e0::/64
IPv6 Delegated Prefix Subnet (including length) 2600:1702:980:25ef::/64
IPv6 Delegated Prefix: 
2600:1702:980:25ef/64
Start Range:  2600:1702:980:25ef:0:0:0:0
End Range:  2600:1702:980:25ef:ffff:ffff:ffff:ffff
No. of host:  18446744073709551616
2600 1702 980 25ef 0000 /68 
2600 1702 980 25ef 1000 /68 
2600 1702 980 25ef 2000 /68 
2600 1702 980 25ef 3000 /68 
2600 1702 980 25ef 4000 /68 
2600 1702 980 25ef 5000 /68 
2600 1702 980 25ef 6000 /68 
2600 1702 980 25ef 7000 /68
2600 1702 980 25ef 8000 /68 
2600 1702 980 25ef 9000 /68 
2600 1702 980 25ef A000 /68 
2600 1702 980 25ef B000 /68 
2600 1702 980 25ef C000 /68 
2600 1702 980 25ef D000 /68 
2600 1702 980 25ef E000 /68 
2600 1702 980 25ef F000 /68
Subnet this into 32 networks?
2^5 = 32
You take the power of 5 and add it to 64 
/64 + 5 = /69

You take the block to the left of 25ef 
You create an interesting mask 1111b nibble

8 4 2 1 16 constant 
1 1 1 1 = 15 mask nibble

subtract them 
16 constant 
- 15 mask nibble 
1 interesting nibble

So we did the first bit. 2^4 is done.  We have 2^1 to do on the next bit

8 4 2 1 16 constant 
1 0 0 0 = 8 mask nibble

subtract them 
16 constant 
- 8 mask nibble 
8 interesting nibble

2600 1702 980 25ef 0000 /69
2600 1702 980 25ef 0800 /69
2600 1702 980 25ef 1000 /69
2600 1702 980 25ef 1800 /69 
2600 1702 980 25ef 2000 /69 
2600 1702 980 25ef 2800 /69
2600 1702 980 25ef 3000 /69 
2600 1702 980 25ef 3800 /69
2600 1702 980 25ef 4000 /69
2600 1702 980 25ef 4800 /69  
2600 1702 980 25ef 5000 /69 
2600 1702 980 25ef 5800 /69
2600 1702 980 25ef 6000 /69 
2600 1702 980 25ef 6800 /69
2600 1702 980 25ef 7000 /69
2600 1702 980 25ef 7800 /69
2600 1702 980 25ef 8000 /69 
2600 1702 980 25ef 8800 /69
2600 1702 980 25ef 9000 /69 
2600 1702 980 25ef 9800 /69
2600 1702 980 25ef A000 /69 
2600 1702 980 25ef A800 /69
2600 1702 980 25ef B000 /69 
2600 1702 980 25ef B800 /69
2600 1702 980 25ef C000 /69 
2600 1702 980 25ef C800 /69
2600 1702 980 25ef D000 /69 
2600 1702 980 25ef D800 /69
2600 1702 980 25ef E000 /69 
2600 1702 980 25ef E800 /69
2600 1702 980 25ef F000 /69
2600 1702 980 25ef F800 /69
Here is the first subnet range
2600 1702 980 25ef 0000 0000 0000 0000 to 2600 1702 980 25ef 07FF FFFF FFFF FFFF

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