# Mifare UID Decimal formats

Example:

Sector 0 Block 0 Data: <span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(252, 255, 1);"><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: red;">80</span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span>CD<span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(1, 255, 255);">E6</span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(255, 0, 254);">D6</span></span> 7D 88 04 00 88 98 00 20 00 00 00 F8

**Single size UID (4-byte)**

UID "in order" (Big Endian): <span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(252, 255, 1);"><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: red;">80</span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span>CD<span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(1, 255, 255);">E6</span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(255, 0, 254);">D6</span></span>

UID "in reverse bytes order" (Little Endian/Intel): <span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(252, 255, 1);"><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(255, 0, 254);">D6<span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span></span></span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(252, 255, 1);"><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(1, 255, 255);">E6</span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: white;"> </span></span><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(252, 255, 1);">CD</span> <span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: rgb(252, 255, 1);"><span data-keep-original-tag="false" data-original-attrs="{"style":""}" style="background-color: red;">80</span></span>

Decimal: 3605450112

References:

- [https://www.starnfc.com/mifare-1k-uid-number-format ](https://www.starnfc.com/mifare-1k-uid-number-format)
- [https://www.mifare.net/support/forum/topic/mifare-uid-number](https://www.mifare.net/support/forum/topic/mifare-uid-number)