Other ID Types

This page covers additional ID types that idt can inspect and work with.

KSUID

K-Sortable Unique Identifier - a 160-bit identifier from Segment.

Property	Value
Bits	160
Sortable	Yes
Timestamp	Yes (second precision)
Format	Base62
Length	27 characters

Format

0ujsswThIGTUYm2K8FjOOfXtY1K
|-------------------------|
  27 Base62 characters

Structure

Timestamp: 32 bits (seconds since epoch)
Payload: 128 bits (random)

Characteristics

Second-level timestamp precision
128 bits of randomness
Base62 encoding (alphanumeric, case-sensitive)

Specification

https://github.com/segmentio/ksuid

MongoDB ObjectId

MongoDB’s default document identifier.

Property	Value
Bits	96
Sortable	Partial
Timestamp	Yes (second precision)
Format	Hexadecimal
Length	24 characters

Format

507f1f77bcf86cd799439011
|----------------------|
  24 hex characters

Structure

Timestamp: 32 bits (Unix seconds)
Machine identifier: 24 bits
Process ID: 16 bits
Counter: 24 bits

Inspection

idt inspect 507f1f77bcf86cd799439011

Specification

https://www.mongodb.com/docs/manual/reference/method/ObjectId/

TypeID

Type-prefixed, sortable identifiers.

Property	Value
Bits	128
Sortable	Yes
Timestamp	Yes
Format	Prefix + Base32

Format

user_01h455vb4pex5vsknk084sn02q
|---|-------------------------|
prefix     UUIDv7 in Base32

Characteristics

Type prefix for clarity (e.g., user_, order_)
UUIDv7 encoded in Base32
Type-safe across systems

Specification

https://github.com/jetify-com/typeid

XID

Globally unique, sortable 96-bit identifier.

Property	Value
Bits	96
Sortable	Yes
Timestamp	Yes (second precision)
Format	Base32
Length	20 characters

Format

9m4e2mr0ui3e8a215n4g
|------------------|
 20 Base32 characters

Structure

Timestamp: 32 bits (Unix seconds)
Machine ID: 24 bits
Process ID: 16 bits
Counter: 24 bits

Characteristics

Compact (20 characters)
URL-safe
Inspired by MongoDB ObjectId

Specification

https://github.com/rs/xid

CUID

Collision-resistant Unique Identifier.

Property	Value
Bits	~128
Sortable	Partial
Timestamp	Yes
Format	Custom Base36

Format

cjld2cjxh0000qzrmn831i7rn
|-----------------------|
  25+ characters

Structure

c prefix
Timestamp
Counter
Client fingerprint
Random block

Specification

https://github.com/paralleldrive/cuid

CUID2

Secure, collision-resistant identifier (CUID successor).

Property	Value
Bits	Variable
Sortable	No
Timestamp	No
Format	Base36
Default length	24 characters

Characteristics

Cryptographically secure
No timestamp (privacy-focused)
Configurable length

Specification

https://github.com/paralleldrive/cuid2

TSID

Time-Sorted Unique Identifier.

Property	Value
Bits	64
Sortable	Yes
Timestamp	Yes
Format	Base32 or numeric

Format

0HXNP0P6V80G8 (Base32)
38352658567418876 (numeric)

Structure

Timestamp: 42 bits
Node: 10 bits
Counter: 12 bits

Characteristics

64-bit (fits in long integer)
Similar to Snowflake but with different encoding options
~139 years of timestamps

Specification

https://github.com/f4b6a3/tsid-creator

Comparison Table

Type	Bits	Sortable	Timestamp	Length
KSUID	160	Yes	Seconds	27
ObjectId	96	Partial	Seconds	24
TypeID	128	Yes	Millis	Variable
XID	96	Yes	Seconds	20
CUID	~128	Partial	Yes	25+
CUID2	Variable	No	No	24
TSID	64	Yes	Millis	13-17

Support Status

These ID types have varying levels of support in idt:

Type	Generate	Inspect	Convert	Validate
KSUID	Planned	Partial	Partial	Yes
ObjectId	Planned	Partial	Partial	Yes
TypeID	Planned	Partial	Partial	Yes
XID	Planned	Partial	Partial	Yes
CUID	No	Partial	Partial	Yes
CUID2	No	Partial	Partial	Yes
TSID	Planned	Partial	Partial	Yes

“Partial” means the feature works for basic cases but may not support all options.

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