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Czech Company Registry & ARES Monitor

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Monitor Czech companies by IČO in ARES. Track changes to name, status, address, legal form, DIČ and CZ-NACE across runs. Export supplier watchlist snapshots and changes.

Pricing

$3.00 / 1,000 company checkeds

Rating

0.0

(0)

Developer

Vadim Bezrukov

Actor stats

Bookmarked

Total users

Monthly active users

a day ago

Last modified

Categories

Business

Automation

Developer tools

Record type

record_type

Required

BASELINE is the first stored observation for this IČO under this monitor key. CHANGE carries a non-empty change_types. SNAPSHOT is an unchanged current observation. NOT_FOUND is an authoritative absence from the register. ERROR is rejected input or source work that was not verified - never an observation of a company.

Type:string

Options:

BASELINECHANGESNAPSHOTNOT_FOUNDERROR

Per-company status

status

Required

SUCCESS and NOT_FOUND are conclusive answers from ARES. PARTIAL and SOURCE_FAILED are unverified checks. SKIPPED means the run charge limit could not fund this check. Unverified and skipped rows carry no observation and preserve the previous baseline.

Type:string

Options:

SUCCESSNOT_FOUNDPARTIALSOURCE_FAILEDINVALID_INPUTSKIPPED

Monitor key

monitor_key

Required

The baseline namespace this row was compared within.

Type:string

IČO

ico

Required

Normalized eight-digit Czech company identifier, exactly as sent to ARES. Null only on a rejected input row.

Type:string | null

As submitted

submitted_ico

Required

The watchlist entry as the caller wrote it, echoed unchanged so results join back to the input.

Type:string | null

Present in ARES

found

Required

True when the register returned a record. False is an authoritative absence. Null when nothing was verified.

Type:boolean | null

Registered business name

business_name

Required

Obchodní jméno as published by ARES.

Type:string | null

Derived entity status

entity_status

Required

Summary of the three core registers (ROS, VR, RES). ACTIVE means every core register that knows this company says active. MIXED means they disagree, which typically indicates liquidation or winding-up - read source_registrations. This is a mechanical summary of public register states, never a creditworthiness, KYC or legal conclusion.

Type:string | null

Options:

ACTIVEINACTIVESUSPENDEDFUTUREMIXEDUNKNOWNnull

Legal form

legal_form

Required

Official legal-form name from the ARES PravniForma dictionary, falling back to the code when the dictionary is unavailable. Presentation only: change detection uses legal_form_code.

Type:string | null

Legal form code

legal_form_code

Required

Three-digit ARES legal-form code. This is what LEGAL_FORM_CHANGED is computed from.

Type:string | null

VAT ID (DIČ)

vat_id

Required

Czech DIČ in CZ + digits form, when the company has one. Null means ARES publishes no DIČ for it.

Type:string | null

VAT group DIČ

vat_group_id

Required

DIČ of the VAT group the company belongs to, when ARES publishes one.

Type:string | null

Registered address

registered_address

Required

The register's own formatted address, whitespace-normalized. Composed from the structured fields for the rare records ARES publishes without one.

Type:string | null

Canonical registered address

canonical_registered_address

Optional

Structured address used for comparison and fingerprints in schema version 2. The original ARES display string remains in registered_address. Falls back to source text when structural components are unavailable.

Type:string | null

Structured address

address_detail

Required

Country, region, district, municipality, street, numbers, postal code and the RÚIAN address-place code. For filtering and geography; ADDRESS_CHANGED uses the canonical structured address plus the address-place code.

Type:object | null

Registration date

incorporation_date

Required

Datum vzniku, ISO-8601 date.

Type:string | null

Termination date

termination_date

Required

Datum zániku, ISO-8601 date. Usually null: ARES removes struck-off subjects from the register, which surfaces as a NOT_FOUND change rather than a date.

Type:string | null

CZ-NACE codes

nace_codes

Required

Current CZ-NACE (2025) activity codes, sorted and deduplicated so a source reordering is never reported as a change. The superseded CZ-NACE 2008 list is not carried.

Type:string[]

source_registrations

Required

One entry per ARES source register (VR, RES, ROS, RZP, DPH, SZR, IR, CEU and others) with its published state: AKTIVNI, ZANIKLY, HISTORICKY, POZASTAVENY, BUDOUCI, LOGICKY_SMAZANY or NEEXISTUJICI.

Type:object[]

Change types

change_types

Required

LEGAL_NAME_CHANGED, ENTITY_STATUS_CHANGED, LEGAL_FORM_CHANGED, VAT_ID_CHANGED, ADDRESS_CHANGED, NACE_CHANGED, SOURCE_REGISTRATION_CHANGED, INCORPORATION_DATE_CHANGED, TERMINATION_DATE_CHANGED, NOT_FOUND or FOUND. Empty on baselines, unchanged snapshots and diagnostics.

Type:string[]

Field-level changes

changes

Required

Previous and current values for each changed field. Array fields also carry added and removed.

Type:object

Source

source

Required

Constant cz_ares_ekonomicke_subjekty.

Type:string

Stable source id

source_id

Required

The IČO, stable across runs, so rows join to their own history.

Type:string

Official record URL

source_url

Required

The public ARES REST record this observation came from.

Type:string | null

source_last_updated_at

Required

Datum aktualizace: when ARES last touched the record. Provenance only - it is excluded from change detection, because ARES advances it even when nothing in the company changed.

Type:string | null

Primary ARES source

primary_source

Required

Which register ARES treats as authoritative for this record (ros, vr, res, rzp, szr).

Type:string | null

Observed at

observed_at

Required

UTC ISO-8601 timestamp of this run. Every row is an observation at a point in time, not a statement of permanent fact.

Type:string

Record schema version

schema_version

Required

Type:integer

Fingerprint

fingerprint

Required

SHA-256 over the semantic fields only. Equal fingerprints across runs mean nothing meaningful changed.

Type:string | null

Error

error

Required

Category, code, message and retryable flag on rejected input and unverified checks. Null on every observation.

Type:object | null

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