Lava's IPv6 Subnet Prefix Reference Chart v0.1

Useable addresses: Network size minus two for Network & Broadcast and:
IPv6 uses 8 sets of 4 hex values, 16 bits each (128bit total)
/48 ISP "site assignments" have 65k possible subnets: bourne$ for a in {1..65536}; do printf "%04X\n" $a; done
Withing a /48, any combination of /49 ---> /64 are valid supernets (departmental, facility, function, other organizational model): $ ipv6gen 2001:0DC6:FF2B::/48 63|more
...normally three or four more hosts are used for: 1) Switch VLAN1 2) Router Interface or 3) Two HSRP interfaces at .253 & .254
"Route Summarization" = "Route Aggregation" = "Supernetting"
"terminal ip netmask-format [bitcount|decimal|hex]" on Cisco IOS to show netmasks as Dotted Decimal v.s. Hex
Print this document and keep on wall in cubical at all times. Memorize for fun. Quiz your spouse, offspring, inlaws, etc.
#include <std/disclaimer.h> in the event that a typo within snowballs your entire corporate network

CIDR	2^x Host Bits	# of Hosts	# of /96s	# of /64s	# of /56s	# of /48s	Netmask (dec)	Hex - ifconfig(8)	Binary Netmask
/0	2^128	340,282,366,920,938,463,463,374,607,431,768,211,456	-	-	-	-		0000:0000:0000:0000:0000:0000:0000:00000	-
/8	2^120	1.3292279957849158729038070602803e+36	-	-	-	-
/16	2^112	5.1922968585348276285304963292201e+33	-	-	-	-
/32	2^96	79228162514264337593543950336	18446744073709551616	4294967296	16777216	65536
/48 (*)	2^80	1208925819614629174706176	281474976710656	65536	256	1
-------					-----
/49	2^79			32768	128	-
/50	2^78			16383	64	-
/51	2^77			8192	32	-
/52	2^76			4096	16	-
/53	2^75			2048	8	-
/54	2^74			1024	4	-
/55	2^73			512	2	-
/56	2^72	4722366482869645213696	1099511627776	256	1	-
/57	2^71			128	-	-
/58	2^70			64	-	-
/59	2^69			32	-	-
/60	2^68			16	-	-
/61	2^67			8	-	-
/62	2^66			4	-	-
/63	2^65			2	-	-
/64	2^64	18446744073709551616	4294967296	1	-	-		ffff:ffff:ffff:ffff:0000:0000:0000:0000
/96	2^32	4294967296 (4 billion)	-	-	-	-
------
/97	2^31	2147483648
---------
/126	2^2	4
/127	2^1	2
/128	2^0	1	-	-			-	ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff	-