RK #166038

55

members (measured 8 Oct 2026, 12:38 UTC)

14 September 2010

created (per Roblox API)

10 August 2026

first measured by this register

Game studiosENabandoned groupunclear purposegroup adoption

Description

RK was once a group...I really don't know what RK stood for, the group didn't have a description when I adopted it. It may of stood of something like "Roblox Killers". I'm sure I can find some use for this group, if not I'll put it back up for adoption. Until further notice, Roblox Space Defenders runs this group still. - Jackboog21

Written by the group; not a statement by this register.

Membership history

Growth

3 measurements spanning 48 days, net +4. Dots are measurements; the straight line between them is drawn to join them, not to claim we know the path taken in between — snapshots are recorded only when a count changes, so gaps mean “no change observed”, never “interpolated”. The vertical axis spans 50–56 and does not start at zero.

Measurement log — every members count we have recorded
Measured (UTC)	Members	Change
8 Oct 2026, 12:38	55	+1
15 Sept 2026, 01:04	54	+3
21 Aug 2026, 14:08	51	first reading

Ownership

Owned by @jackboog21 as measured.

Groups seen changing owner — the largest ever handed over and the most recent — are on the ownership transfers board.

Members we’ve seen

@jackboog21 — Owner (rank 255)

hty (@progamz2022) — Member (rank 1)

A sample — only members this register has independently measured, highest rank first. Not the full roster.

Rank structure

Owner1

Admin0

Member51

Member50

Guest0

Roles and per-rank member counts as Roblox reports them (rank 0 = guest … 255 = owner).

Related groups

Groups whose measured members overlap with this one — a sample from our membership graph.

BIG Games Pets#3959677 · 1 shared members

The Gang Stockholm#5273516 · 1 shared members

[HS] Haze Studios#6602131 · 1 shared members

Easy.gg#5774246 · 1 shared members

Fishy Robux#5293484 · 1 shared members

GamesReborn#3991320 · 1 shared members

Moonlight Productions.#7311036 · 1 shared members

Mithril Games#3497226 · 1 shared members

SizzleBurger#1016598 · 1 shared members

#Streetz War 2#14757762 · 1 shared members

BlueDevGroup#7040466 · 1 shared members

Ursa Major Games#10040680 · 1 shared members

Open data

Download this group’s measured record — free to reuse with attribution: membership history (CSV) · full record (JSON)

Each file carries its licence and retrieval time inside it, and is generated from the same measurements shown above.