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. 
f8f0c813-d801-4090-9b09-7c8ae797e3f8
15406ca6-c381-4eea-8cba-29e03c1a80f1
c5cc9c06-96a8-4436-b6ac-98156d9ecd87
f9563b4b-1d9e-48ea-94f3-34052317a729
dae409e1-8a49-4dc6-ba44-21a4e03ef917
2b31021a-1b1c-4fd6-acee-38e3805a5160
9c003c66-6031-4bd1-be8d-1c1c6b265b1c
00a9a7e9-421f-4563-baef-baaaccc20932
a0617ca6-d3b2-4ee3-8126-7afd3905ab8f
57cab0d2-719c-4663-b496-143bf6ac62c4
41c63549-960d-45c7-99e7-e8069a9537dd
d1300edb-8e0d-4e5b-8f1b-88499c2e745a
5881bef3-7cd7-4210-b9b9-b6f9362abe35
c0937ad4-59f2-4121-bc50-1b3da5a55a9c
8ad76404-2793-430f-bd24-b7602bd6d2ba
5f606b54-d011-4b68-928f-a9fd8193d903
7af8d5ce-3604-41f2-8fb9-1530eabb3098
d60b09ed-733c-44da-bc57-cb698c0ab07d
91162a66-6247-4b1e-9cd9-2cb0294be0c3
2b7feaa1-8ff8-4d3e-849a-c269252333c7

Double UUID V4

256 bits, 32 bytes, 244 nits of entropy

2.8269553 × 1073 possible IDs 

2174ebcd-0a27-42fe-9c21-6144b87084d7-26eeacd4-1721-48b3-89b3-22146b17a14a
5571e6c6-791b-4c04-a295-6d95d21c12c5-3a875a98-9546-4f1f-951f-1f4a95107913
d90d0aec-5d58-453b-a0ad-6b41ce141f7a-519c7726-e75d-4484-8011-1090368d7c41
16c785ae-c994-4a9f-8207-71df0ca7446a-b9451e01-d8f5-436a-8e00-76540427c9d1
4311b2d8-5d6b-4ff2-9cdc-7dfd5b5969ac-e393878e-ec1d-4fad-b8a5-c4231fbfb208
e79d5391-2fd3-43d9-9db0-e41abc85c801-f6213000-8e0c-4aec-b2c3-ae2e5fa9cf36
b5351af4-496b-406f-88c2-a45abb155e33-00a52613-b91a-414f-a4d9-7f594c83fe59
a8b2bb38-44b9-4fc8-9e8c-7747364d0047-82402e4f-9691-440b-be33-591d55fe04de
9ac19cf3-3798-4dbe-b239-a71d3314596c-c15ba1cc-be1e-4d78-b168-8a83c58a8101
1b14a389-d0ac-44a1-b49b-ec6122486441-7aa60f20-7a31-40f3-a8b8-65e33ab47c21
1d461ac3-8f6a-4bb3-b380-67d1eed69599-d08aa99e-2caf-4c97-9f47-885ec9bd2bf0
70661d68-e137-4bd5-a4ec-bf6f9d74bb45-8790ac00-24a0-454b-8c8b-fbc17142cec5
b443e8d3-6f2a-4980-a557-cb2bd34df5d4-819f35fc-b9c0-4f98-ae2e-26a26638fe21
672c41c8-9861-4645-91e7-4c5a84faf86f-ae2d22a2-3b2b-4213-bdc9-ddc2ced9abd8
dff671db-05e3-4d02-9faa-73edf233763a-1bebd9ad-a848-4da4-9661-ed25ed4f6657
05789ba2-56ec-4cdd-afc3-e2a2061e5608-b2a24c8f-f82b-4662-bd61-506cb8c65fa5
d7a321bf-75b7-44c9-a896-1a3881a536aa-fc25d469-7cd2-4b67-9076-258c95ef4c19
65e0224d-867d-4fb8-b7c8-35ab6377a1ef-5dd97103-ed3b-4f84-90ca-c1d42d39ec81
6ce86e67-5bc5-4dbd-b518-84a3a5f6c1fa-393d17b4-9074-4b4b-9a39-cf24c7c73f7a
7843f767-874f-460f-aace-5c75bda94141-b007ae32-cb26-4088-a459-aaee960eb4ed

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 

7RHP-QMG2-9R8M
4QGG-PWH2-655R
XPRQ-V9FC-3QMQ
W833-34VP-2PQF
4QX9-PHXC-86G3
RJ4V-RRJM-VMHP
4JGH-Q838-7R29
22RH-95XX-M9P3
5MQV-PQMQ-G99X
2G87-6WV9-P4QF
M82Q-QG6X-2M8F
WH9V-8GCF-5M46
83HR-J293-RR9C
JQH8-F5P7-V9G2
C35V-FPC6-WMXP
VXC7-GHRC-H2QX
5G2W-GJVF-7765
6WHF-J6PC-CV5J
HVMQ-J9JF-7HF5
H4CG-RV37-QXC5