UUIDs

UUID V4

128 bits, 16 bytes, JSON format

122 bits of entropy, 5.31691198 × 1036 possible IDs

“...the odds of collision between any two is 1 in 2.71 x 1018 Put another way, one would need to generate 1 billion v4 UUIDs per second for 85 years to have a 50% chance of a single collision.”

What are the odds? by Jonathan Hall. 
b94fc11f-34b2-4dc2-ad49-b97eb534e9f7
c338bead-9f6a-4874-b35d-805fff762e56
99f4dc6a-9521-48d1-a509-db4fb285df3b
192fc382-97b7-4303-9e9b-a02b62152add
8fccf573-76b6-4b09-b249-faef27546fdd
07b1957a-d1d2-44b1-9558-babd2f54e4a0
a3a86fe9-e865-48c4-b874-9d29182f91f4
1e7c5995-1d61-46dd-97f1-aaff66dd0dbb
f033a38f-e819-4501-ae31-7e13e8b6719c
423d0d58-5fab-4ee7-ab37-ad48a9597a0e
68864d33-3e31-4cac-9aa7-f11ade8f13b4
4351c82c-3738-460b-b10d-4f448b0e84fe
3c929de7-a1c8-4594-8655-c9699d87432b
8917230c-d551-460f-8491-7cefdf412991
6f98276c-971a-4a23-98b3-73c8a1f42fb8
1de9eaa4-3bb9-401e-8fe2-788e71d38e87
b5e5aaa1-f0a8-4bf1-b618-5c46ac12642c
c56fa124-3a54-4ef4-af75-76b336eee174
f17731d2-58ce-4217-b06a-8b6943cd0c6f
00a7c32c-b0f7-4700-944b-639837096f60

Double UUID V4

256 bits, 32 bytes, 244 nits of entropy

2.8269553 × 1073 possible IDs 

f3f2f9ec-eace-4929-b471-47c08156ab9e-193c06d6-2403-4f9d-8f7a-8db70faf8b14
459c00e2-0afa-4f19-b4a3-6945feb7967e-dd7ec0e0-c472-49b8-b23b-9a4f838492a3
9ff54059-1fec-4154-a973-51f5405440c5-24e62d7f-ebfb-4156-82f0-36303b3f0d1f
2a41e4f2-5af9-49e5-b71e-9b3dc43981e1-aa992b34-4b57-423d-b82a-068d7eb9eae6
2078fc6f-c5c0-405b-b199-9037c4643918-845acfa4-e5f9-48a5-ac26-9249fdf2523e
740e95dd-714b-4f11-ae67-0f894ed89084-23debe33-8498-40f6-b6c0-07a539bffb0f
6ef49418-5799-449f-b72e-afb56b571f52-04161156-2681-4d33-88b7-2ef510110b17
4243e7b4-65b1-4795-8b90-d72644de22a3-75d15743-4b7b-40b4-a23d-f5d23b5ddc33
40c32d95-ce34-4a78-ad94-928e516733cc-6c592302-a877-4ced-b718-dfebacaa993e
559b6b87-d90b-4065-a9d2-0102664aee60-66840b0d-3b4b-4e56-9f3a-709a20af536d
59c6b2e9-dddf-49d9-8adb-e3766a892f57-5e81cb3d-67d0-4a35-80f4-66fc8ddf5c86
e948ed4b-e42e-48b5-8884-9e6d0939304e-bfeec26a-5c88-4d30-9b93-04d0437c9d73
0efbb819-b26c-441a-a06e-8e868b115acc-22c8177b-75e3-4ccb-8137-9d0f850b0a97
564fa2be-3697-4a62-aaca-a49ba45c1cff-0ea4be15-c3f2-4427-8ba7-2bdc8c666eb5
9d3a7cf5-d865-4eba-93c9-f216c79fb1c2-b977dfe7-fbcb-48eb-bf2f-3886b9df35c2
1f154e5c-f20b-47f4-89b2-a7e2151e6388-17a799e5-2c5a-4dba-a1f7-450438ee9a11
63cc9fe6-9769-4306-bea6-1289b6649d77-82777998-8762-4b53-ab90-63b6d3f298dd
c1f297b6-ca8e-4106-a24f-55e2b2767109-6244516d-0f2f-4613-bc9b-5cdb6864f197
aa219929-8186-482c-9e77-13b3eb5c4147-1fec4ffa-06f6-49ef-9cea-5f750d56889b
238aad13-2878-4d68-a4dc-a1a634cb66ed-898b63a9-68b4-40e4-8269-bbcb88d3d821

OLC IDs

Open Location Code (OLC) alphabet Ids. OLC is a geocoding system that encodes latitude and longitude into a short string of characters. The alphabet is simplified to use only uppercase letters and digits, excluding characters that can be easily confused (like '0' and 'O', '1' and 'I').

4,096,000,000,000,000 or 4.096 × 1015 possible IDs 

746G-RFXW-4WP8
F58X-2MXJ-35X7
G2WQ-PQ8G-93Q2
9RC7-H287-P94Q
RQM4-PCP2-5X89
G3HC-4FRW-M2CM
GX7W-9MQG-G64X
3WM3-MHHF-C84Q
PJF7-4XW5-976W
P59Q-F8QV-764G
3VQ3-QVF6-MPW5
HWCQ-6MPH-757J
V3F7-3MX8-FQH7
295G-6652-GHVF
G2XM-5J86-4C8Q
XQG2-H4JR-289G
65MQ-CJH4-M2PJ
3923-9724-7HMX
V2WM-HQ97-G46H
8CG7-4H69-39MF