S Signal2 Card Catalog
aio.online List your site across the whole network — one submit Submit once on aio.online and get listed on 500+ web directories at the same time. Get listed on 500+ sites →
25295Cards Filed
Cat. No. 001 Est. MMXXVI Subjects A–Z

Signal2
Card Catalog

A surveyed record of 835 online destinations, catalogued across 22 subject districts.

25295 Cards
22 Drawers
Free to file
Open to all

Submit your site to the Signal2 gazetteer

Site owners may add their domain to the relevant district of the Signal2 index free of charge. Submissions are reviewed before listing. Free to list

+ File a card

Recently filed

The card file
Ref. 01 26 cards

Academic Institutions & Training Centres

ashianapublicschool.com · autoescola-autoroute.com · bawakeerschools.com …
Pull this drawer →
Ref. 02 28 cards

Automotive Trade & Transport

1autoparts.com · acilmotokurye.org · akcenotomat.com …
Pull this drawer →
Ref. 03 1578 cards

Builders, Traders & Household Services

10-medical-plaza.amp.pr · 18-pharmacy.amp.pr · 1st-choice-physical-therapy.amp.pr …
Pull this drawer →
Ref. 04 67 cards

Clinics, Pharmacies & Health Providers

101apotheek.com · 123psychiatry.com · acmelaser.com …
Pull this drawer →
Ref. 05 1524 cards

Dental Surgeries & Oral Health Clinics

139-mooring-buoy.amp.pr · 1786-high-meadow-trail-by-redawning.amp.pr · 180-lpcr.amp.pr …
Pull this drawer →
Ref. 06 1972 cards

Documents, Permits & Official Records

0-mile-art.amp.pr · 110-bingo-hall.amp.pr · 194-bargain-stop.amp.pr …
Pull this drawer →
Ref. 07 157 cards

Financial Services & Digital Assets

2nd-mortgage.tw · academia-colegio-marin-amat.amp.pr · academy-for-science-and-design.amp.pr …
Pull this drawer →
Ref. 08 1551 cards

Food Purveyors & Catering Establishments

10700-coastal-highway-unit-2203.amp.pr · 1170ags-properties-llc.amp.pr · 124132-clyde-condo-assc.amp.pr …
Pull this drawer →
Ref. 09 125 cards

Gaming Houses & Wagering Venues

3377win.fun · 3a1588.com · 609club.net …
Pull this drawer →
Ref. 10 190 cards

General Entries & Miscellany

123caaarts.com · 1777hoya.com · aabb.co.com …
Pull this drawer →
Ref. 11 26 cards

Homeware, Fixtures & Interior Suppliers

aunar3d.com · celticheritageinteriors.co.uk · divan-matras.com …
Pull this drawer →
Ref. 12 21 cards

Industrial Works & Supply Trades

bimakskimya.com.tr · deepmould.net · diplast.com …
Pull this drawer →
Ref. 13 31 cards

Journals, Broadcasts & Press Outlets

1966films.com · a-drones.com · aivid.video …
Pull this drawer →
Ref. 14 5 cards

Land, Dwellings & Lease Records

homerunimprovement.com · mik-location.com · myhomequote.com …
Pull this drawer →
Ref. 15 18 cards

Legal Counsel & Court Services

ajalawfirm.com · boardwalklaw.ca · eli-uk.com …
Pull this drawer →
Ref. 16 13 cards

Print Houses & Packaging Suppliers

cartridgeworld.gr · cemsatex.com · drukowalnia.pl …
Pull this drawer →
Ref. 17 17649 cards

Social Listings & Personal Notices

056-express-auto.amp.pr · 1-auto-repair.amp.pr · 1-cycle-parts.amp.pr …
Pull this drawer →
Ref. 18 215 cards

Software Firms & Technology Platforms

88vv2.net · 8ss8.net · 98win.archi …
Pull this drawer →
Ref. 19 12 cards

Sundries, Timepieces & Grooming

aobiomecosmetics.com · hairtrans.net · jorgejuanjoyeros.es …
Pull this drawer →
Ref. 20 13 cards

Veterinary Practices & Pet Keepers

alphagroomingpetsalon.com · artpetgrooming.com · celticstarkennels.com …
Pull this drawer →
Ref. 21 36 cards

Voyages, Accommodation & Tour Operators

3sixtykiteschooltarifa.com · a-sparks.com · a-sparks.com.ua …
Pull this drawer →
Ref. 22 38 cards

Web Agencies & Digital Promotion

aimarketing.com.hk · backlynk.io · birinciseo.com.tr …
Pull this drawer →

Catalog questions

Is it free to list my site?

Yes. Signal2 accepts a single listing per domain at no cost. Submit your site using the Add a Site form and it will be reviewed and added to the appropriate district of the gazetteer once confirmed.

What is Signal2?

Signal2 is a free web directory that catalogues reviewed sites across 22 subject districts. It operates on the model of a printed gazetteer — a systematic public record of online destinations, organised by subject and open for browsing without charge.

How are sites organised in Signal2?

Sites are grouped into 22 subject districts ranging from Automotive Trade and Transport to Voyages, Accommodation and Tour Operators. Within each district, entries appear in the order they were reviewed and confirmed. There is no ranking or scoring — all confirmed listings are presented on equal terms.

How do I submit a site?

Use the Add a Site link to reach the submission form. Provide your site address and select the most appropriate district. Your submission will be reviewed, and if it resolves correctly and fits the chosen category, it will be added to the Signal2 index.

Do you review all submissions?

Yes. Every submission is checked before it appears in the gazetteer. The review confirms that the submitted address resolves and that the site corresponds to the selected district. Submissions that do not pass review are not added to the public record.

How many sites are listed?

The Signal2 gazetteer currently holds 835 confirmed entries across its 22 districts. The index grows on a rolling basis as new submissions are reviewed and confirmed.

Can I update my listing?

To request an update to an existing listing, use the Add a Site form and include the relevant details. The review team will assess the request and update the record if the information is confirmed.

About the Signal2 catalog

Signal2 is a free web directory organised in the manner of a printed gazetteer, cataloguing 835 reviewed sites across 22 subject districts. Each district corresponds to a field of commerce or interest, from Gaming Houses and Wagering Venues to Voyages, Accommodation and Tour Operators. Entries are submitted by site operators and pass a basic review before being added to the public record. The index is designed for straightforward browsing rather than algorithmic ranking — visitors may navigate by district or search by keyword. Signal2 accepts submissions from site owners at no cost, adding confirmed entries to the relevant district as each review is completed. The gazetteer is updated on a rolling basis as new submissions arrive.