io.github.ofershap/dns

mcp-server-dns

Is the io.github.ofershap/dns MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

MCP server for DNS lookups, reverse DNS, WHOIS, and domain checks — zero auth, zero config

alive probed 2026-11-14 · unchanged since 2026-10-30

5tools

883tokens in Claude Opus 5.5

0.4 %of Claude's 200k window

0.4×the median server

191 msto initialize

5 msto list tools

Run it: npx -y mcp-server-dns@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mcp-server-dns 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 883 tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 918. The o200k_base estimate is 489. Counted again when the tool definitions change. Method.
Repository: https://github.com/ofershap/mcp-server-dns
Registry: active, updated 2026-03-10 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.81×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
dns_lookup	289	160	33 %
resolve_all	164	91	19 %
whois	152	84	17 %
reverse_dns	144	80	16 %
check_nameservers	134	74	15 %

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

Servers that mention ofershap.

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.