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. 
7f04995c-acbc-45c6-804c-73305e3039d6
1a040371-3a4e-4fc2-9364-03d53fe6e31e
dc781f99-54b1-467d-9855-35d9d4d75d9f
a5ad03ae-5f9d-43e5-9733-a7fd079e74ca
72f3f60c-fe9c-41f5-9968-965543309c33
3cdb6dfd-3c61-42f6-b6bb-38f908bbe28b
14a9995f-c7e7-40c0-bf8a-60e9df2d20c1
a57425ca-633a-4b76-ac7d-b7b24b73b5c2
9b6aa29d-43fb-4588-94e2-ca264f21d1b3
44115dde-71ff-46ad-8ebe-30cc5a4a936d
c67710c5-fddf-444f-820d-ef3a97641764
983e32f9-3f49-4d80-85d5-b16ff9ce611a
fb2009c8-0234-4466-b57f-95d9c8f93070
40a3f6b3-3d70-4d0d-8a8b-7c422a09baf4
db26b57a-7fb5-4959-aad9-102075029f64
4c617dbb-61f5-4138-962e-b74e9d2b4bd8
5dff106b-88eb-4747-9745-857255313c0d
72f699ab-28bc-4f3d-99c1-878bda90dae1
b6bca96d-5bf8-471a-9bbf-964fbed7027a
1a30fbab-c911-408c-a507-4c3bd40be42b

Double UUID V4

256 bits, 32 bytes, 244 nits of entropy

2.8269553 × 1073 possible IDs 

c36e34fe-e0b9-4c8b-8d71-f7f747e80cc7-643b4a08-5aba-4a77-8359-c03bbc678ef7
4bf4b907-75d8-4981-8dff-09b1e5f90bde-6a20b73d-b823-42ca-8adc-b29ed39bde21
61598121-3756-41a4-9f33-04cd6ed7efb6-86da332a-b032-4e07-8d9e-91e7d292070a
0cafbcb6-99d4-4ff5-8d63-d888b845e639-e9f7b651-3c2d-46ed-b5d3-ccbfccc03250
6e49a0ee-7a39-4fb5-bc4c-8cda45bd5c38-e5bb852a-1750-4f17-adb7-a747ad953ceb
508a4cb4-a422-41df-ab57-169ba3385e7f-0d831e56-4312-4de9-938e-ec25e5a59c41
ad33e012-d8cd-4d4e-973d-54780785fb46-ae161e64-4ce4-4e5e-84a1-d66bae471cf2
2701dd25-bd99-4989-9862-1271a93017b8-185e3ca6-9545-463d-825f-6731fb7038b1
40fd3b16-adf1-41c0-8c3d-93ddecc1dd5b-bdec5d2c-a21e-445c-a52a-034c7b593391
157ede7a-be4a-4c8e-8a7d-6c0c3f032d32-a978bca5-d87a-4679-9010-8a6d111c4cc0
7c68adf7-7e96-4f7d-98bf-9d395d7f52d1-b50d8e9f-dbef-43bf-b34e-3be83d7e84dd
17137cc9-617a-4cdc-aeb1-a43c1cb51ef1-f4e572d3-e8cb-495a-9195-c48fd3a105d0
8aea9382-fd1e-4853-bca5-e8c9683dadbe-50a1e304-0301-4eff-bcfe-e766d6177d80
63f02549-7674-4a28-bb11-3c9cd9a7cfc9-968390a0-be98-4984-9447-69c3a0dafadf
38426eaf-603a-4d42-a390-2bf96ed3f0cc-9db1021b-6e51-4b79-b1c3-0fde9020c1bb
7cfb1418-4829-44ba-894e-b12691e0d3e3-a8215bf3-08ff-4cd9-b985-b99c841b475d
46cb64dc-a11f-411c-8ac3-6255d1473484-7fe9d6c7-ae94-4d5c-9cd7-c03809b85b04
506b7647-d432-400b-96f5-cb80e54a5c2c-3c225686-415f-4bc9-9ca8-4d5140a42bfd
a980200d-f3b3-4007-bc05-004cf68f54f9-b62bbda6-02f3-4221-8193-7ec74191c0a7
9a61e488-24e1-4031-8a97-894611e05193-6f31924f-67e2-4436-978b-9072d8d2b821

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 

75XX-MV85-HHW2
M9V5-GJ97-8358
7Q7R-8M9F-P6XC
GGXR-5235-9CJG
M5FV-8QPV-J56Q
PP72-M872-F8MP
C4W4-R9RV-M22R
229W-FRC3-C92Q
G999-35V2-6FCP
C92P-2V26-9777
H7G9-J9VR-9RF8
X8G6-XF9G-45VV
4MQP-MJ4X-FCXG
2CC2-F687-3C37
2H5F-W2C5-5G9X
6584-Q32J-WW4G
CHWP-XMFJ-M23F
FQPG-6PF5-P23P
J642-58JX-V7VF
R798-6PH5-J27P