Backed by a live hostname index

Every hostname a domain has ever shown

Type an apex domain. Get back the subdomains observed in certificate transparency logs, historical sources and active probing — each with the date it was first seen.

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Trygithub.comstripe.comvercel.comdevbit.in
01

Certificate transparency

Public CT logs record every certificate a CA issues. Each one names the hosts it covers.

02

Historical and probing sources

The index folds in several public historical datasets and its own probing to catch names CT alone would miss.

03

One queryable index

Apex, subdomain and first-seen date are stored and deduplicated. Certificate metadata is not retained.

Built for the part after the list

A raw dump of forty thousand hostnames is not a finding. These pages are shaped around filtering, grouping and getting the subset you actually care about back out.

First-seen dates
Every name carries the date it first appeared in a log, so you can tell a decade-old host from one that shipped last week.
Depth-aware view
Group thousands of names by the label directly under the apex, or flatten them into one sorted list. Both are a click apart.
Wildcards flagged
Wildcard certificates are surfaced separately — they hint at whole zones you cannot see by name alone.
Export in one click
Take the full set as newline-delimited text for your tooling, CSV for a spreadsheet, or raw JSON with dates attached.
MCP for agents
The index exposes an MCP endpoint, so an agent client can run the same search tool you use here.
No key to get started
The search endpoint is open: 100 requests per IP per day, no token, no signup. Results here are cached to spend fewer of them.
GET /v1/search

The same index, straight from your terminal

Everything on this site is the public search API. Plain text by default, JSON with format=json, first-seen dates with dates=1.

Read the API reference
Explore the index
curl
curl -s "https://<api-host>/v1/search?apex=devbit.in&format=json&dates=1"
[
  { "first_seen": "2026-04-27T00:00:00Z", "sub": "devbit.in" },
  { "first_seen": "2026-04-27T00:00:00Z", "sub": "www.devbit.in" },
  { "first_seen": "2026-07-11T00:00:00Z", "sub": "test.devbit.in" }
]

Start with one domain

No account, no key. Free search allows 100 requests per IP per day.

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