io.github.mrfentmen/hackertarget-mcp

hackertarget-mcp

Is the io.github.mrfentmen/hackertarget-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-29.

Query HackerTarget's free recon APIs: DNS lookup, reverse DNS, whois, geoIP, HTTP headers.

alive probed 2026-11-14 · unchanged since 2026-10-29

6tools

750tokens in Claude Opus 5.5

0.4 %of Claude's 200k window

0.3×the median server

295 msto initialize

7 msto list tools

Run it: npx -y hackertarget-mcp@1.0.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: hackertarget-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 750 tokens in Claude Opus 5.5, exact, measured 2026-10-29. With the Claude Code prefix mcp__…__ on each tool name: 834. The o200k_base estimate is 394. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/premium-mcps
Registry: active, updated 2026-10-17 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.90×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
dns_lookup	143	75	19 %
geoip_lookup	128	67	17 %
reverse_dns	124	65	16 %
whois_lookup	122	64	16 %
reverse_ip	118	62	16 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention hackertarget or headers or reverse.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.