Prefixes from N to Z cover Natural High (NHDTC, NHDTB), Nagae Style (NSFS), OPPAI (PPPE, PPPD), Premium (PRED), ROCKET (RCTD), SOD Create (START, SDAB, SDNM), Attackers (RBK, SHKD), S1 No.1 Style (SNOS, SONE, SSIS, SSNI), Venus (VENX), Wanz Factory (WAAA, WANZ) and Max-A (XVSR).

The A–M half of the alphabet is in the first lookup table. To browse by company rather than by letter, use the studio code reference.

What do the columns mean?

Prefix is the letter portion of the code, Label is the issuing company or line, and Status says whether the prefix still receives new numbers: Current, Retired, or blank where we have not confirmed it.

This half of the alphabet is dominated by the letter S, which carries S1's six successive main-line prefixes, SOD's parallel SD lines, and several Attackers prefixes. Reading the third character is usually what disambiguates them.

Which label owns each prefix from N to Z?

Prefix Label Status
NHDTA Natural High Retired
NHDTB Natural High Retired
NHDTC Natural High Current
NNPJ Nanpa JAPAN Retired
NSFS Nagae Style Current
NSPS Nagae Style Retired
OFJE S1 No.1 Style Current
PPPD OPPAI Retired
PPPE OPPAI Current
PRED Premium Current
RBD Attackers Retired
RBK Attackers Current
RCT ROCKET Retired
RCTD ROCKET Current
ROE Madonna (MONROE line) Current
ROYD ROYAL (HHH Group) Current
SDAB SOD Create Current
SDDE SOD Create Current
SDJS SOD Create Current
SDMM SOD Create Current
SDMU SOD Create Retired
SDMUA SOD Create Current
SDNM SOD Create Current
SHKD Attackers Retired
SIVR S1 No.1 Style Current
SNIS S1 No.1 Style Retired
SNOS S1 No.1 Style Current
SOE S1 No.1 Style Retired
SONE S1 No.1 Style Retired
SSIS S1 No.1 Style Retired
SSNI S1 No.1 Style Retired
SSPD Attackers
STARS SOD Create Retired
START SOD Create Current
SVDVD Sadistic Village
TEK MUTEKI
URE Madonna Current
VENU Venus Retired
VENX Venus Current
WAAA Wanz Factory Current
WANZ Wanz Factory Retired
XV Max-A
XVSR Max-A Current

Attribution and status checked 2026-08-03 against each label's own release listing and against FANZA product records. Wanz Factory did not stop. Its WANZ line closed in 2020, but the label reopened as WAAA in November 2020 and was still issuing numbers in August 2026 — which is why a failed WANZ lookup is usually a range problem, not a dead label.

Rows we could not confirm are omitted rather than filled in with a plausible guess. Prefix lists in this field are copied between sites along with their mistakes, so the fact that an attribution appears in several places is not independent confirmation of it.

Which prefixes in this range are easiest to confuse?

Three clusters, all beginning with S.

Cluster Prefixes How to tell them apart
S1 main line SOE, SNIS, SSNI, SSIS, SONE, SNOS All one label, six eras; SSNI and SSIS differ by one letter, as do SONE and SNOS
SOD lines SDAB, SDDE, SDJS, SDMM, SDMUA, SDNM One label, parallel concepts, all active at once
SOD performer lines STARS, START Five characters each, differing only in the last

SSNI versus SSIS and STARS versus START are the two pairs most often mistyped, because the difference is a single character in the middle or at the end of a string people copy by eye. If a code in one of these families returns nothing, swapping to its neighbour is the first thing to try — before assuming the release does not exist.

The S concentration also has a practical upside: if you see a code beginning SS, SO, SN, SD or ST with a three-digit serial, you are almost certainly looking at S1 or SOD, which narrows a search considerably even when you have mis-read a character.

What if your code has no letter prefix at all?

Then it belongs to one of the non-studio numbering families, which are not in this table.

Shape Family Where to look
010124-001 Uncensored subscription site How uncensored releases are numbered
HEYZO-1234 Uncensored subscription site Same
n1234 Uncensored subscription site Same
259LUXU-1234 Amateur / planning series Amateur and planning-series codes
FC2-PPV-1234567 Individual-seller platform FC2 codes vs studio codes
1sdab00123 Storefront internal ID Normalise to SDAB-123

The n1234 shape is the one that most often lands people on a studio prefix table by mistake. A single letter is never a studio prefix — nothing in either half of this lookup is one character long — so a lone letter followed by four digits is a signal to switch catalogues, not to keep hunting the alphabet.

Why does this table not show release counts?

Because we have no data that would support one, and a fabricated count in a reference table is worse than an empty column.

Our index stores faces, not catalogue records. There is no maker field, no release date, and no title inventory in it. The only quantity we could compute is how many titles carrying a prefix turn up on the sites we happen to index, which measures one set of aggregators rather than any studio's output.

Boundary worth stating: the index covers 106 sites, but only around a dozen of them carry Japanese-style codes at all, and 2,246 of 2,333 representative images come from a single source (our index, 2026-08 snapshot). Publishing per-prefix counts on top of that skew would present aggregator coverage as industry output.

What do you do when the prefix checks out but the code fails?

Confirm the serial is within the range that prefix reached, then stop working from the number.

Retired prefixes have a highest issued serial. Anything above it was never allocated and cannot be found anywhere — the leading cause of "the prefix is definitely right and it still fails". Which prefixes are closed, and what succeeded them, is covered in codes from studios that no longer release.

When the number is exhausted, the face in the frame is the identifier that remains. Our index compares 512-dimension ArcFace vectors across 241,792 indexed faces and 2,333 named performers at a 0.40 similarity threshold, with detection running in your browser so the original image never leaves your device.

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