Which MCP servers actually work?

We track 51352 servers from the official MCP Registry. 33921 are hosted (remote); we have health-checked 33637 so far. 294 use templated URLs that need user-specific values and can't be checked. Of those checked, 20361 passed a full MCP handshake, 9549 are up but need credentials, and 3727 failed or were unreachable (last check 2026-10-27T13:10:14.812Z UTC). How we check.

ServerUsers (30 d)HandshakeAuthToolsLatencyLast checked (UTC)Category
CRC-16 hex length, input discarded
io.github.sadri-dridi/crc16-len		0HealthyNone3133 ms2026-10-26T07:55:12.455Zagents-and-memory
Latitude/longitude numeric shape
io.github.sadri-dridi/coord-ok		0HealthyNone3119 ms2026-10-26T07:55:12.448Zagents-and-memory
CP437 box-draw band, bytes discarded
io.github.sadri-dridi/cp437-ok		0HealthyNone3133 ms2026-10-26T07:55:12.448Zagents-and-memory
Cross-Origin-Opener-Policy token, value discarded
io.github.sadri-dridi/coop-ok		0HealthyNone3123 ms2026-10-26T07:55:12.433Zagents-and-memory
Cross-Origin-Resource-Policy token, value discarded
io.github.sadri-dridi/corp-ok		0HealthyNone3123 ms2026-10-26T07:55:12.433Zagents-and-memory
CP850 high-bit band, bytes discarded
io.github.sadri-dridi/cp850-ok		0HealthyNone3120 ms2026-10-26T07:55:12.433Zagents-and-memory
Compose service count, body discarded
io.github.sadri-dridi/compose-ok		0HealthyNone3119 ms2026-10-26T07:55:12.431Zagents-and-memory
Cookie name charset, value discarded
io.github.sadri-dridi/cookie-name-ok		0HealthyNone3117 ms2026-10-26T07:55:12.423Zagents-and-memory
Cookie pair count, value discarded
io.github.sadri-dridi/cookie-n		0HealthyNone3123 ms2026-10-26T07:55:12.400Zagents-and-memory
Contrast ratio for two hex colors
io.github.sadri-dridi/contrast-ok		0HealthyNone3133 ms2026-10-26T07:55:12.334Zagents-and-memory
content-address hex length, value discarded
io.github.sadri-dridi/contentid-ok		0HealthyNone3122 ms2026-10-26T07:55:12.311Zagents-and-memory
X-Correlation-Id charset, value discarded
io.github.sadri-dridi/corr-id		0HealthyNone3122 ms2026-10-26T07:55:12.281Zagents-and-memory
Coptic year band
io.github.sadri-dridi/coptic-ok		0HealthyNone3129 ms2026-10-26T07:55:12.261Zagents-and-memory
Connection hop-by-hop count, value discarded
io.github.sadri-dridi/connection-ok		0HealthyNone3127 ms2026-10-26T07:55:12.259Zagents-and-memory
Content-MD5 base64 length, value discarded
io.github.sadri-dridi/content-md5		0HealthyNone3127 ms2026-10-26T07:55:12.255Zagents-and-memory
Content-Location URL shape, value discarded
io.github.sadri-dridi/content-loc		0HealthyNone3139 ms2026-10-26T07:55:12.242Zagents-and-memory
Content-hash filename shape, name discarded
io.github.sadri-dridi/content-hash-ok		0HealthyNone3146 ms2026-10-26T07:55:12.219Zagents-and-memory
Cookie name charset, value discarded
io.github.sadri-dridi/cookie-token		0HealthyNone3146 ms2026-10-26T07:55:12.219Zagents-and-memory
Cords to cubic meters, number discarded
io.github.sadri-dridi/cord-m3		0HealthyNone3135 ms2026-10-26T07:55:12.219Zagents-and-memory
content-id base58 length, value discarded
io.github.sadri-dridi/contentid-b58		0HealthyNone3135 ms2026-10-26T07:55:12.209Zagents-and-memory
IPv6 CIDR shape, value discarded
io.github.sadri-dridi/cidr6-ok		0HealthyNone312269 ms2026-10-26T07:55:12.199Zagents-and-memory
Content-Type token shape
io.github.sadri-dridi/content-type-ok		0HealthyNone3137 ms2026-10-26T07:55:12.108Zagents-and-memory
composer.json name shape, body discarded
io.github.sadri-dridi/composer-ok		0HealthyNone3135 ms2026-10-26T07:55:11.962Zagents-and-memory
reverse COMB UUID layout, value discarded
io.github.sadri-dridi/comb-rev		0HealthyNone3124 ms2026-10-26T07:55:11.949Zagents-and-memory
COMB sequential UUID layout, value discarded
io.github.sadri-dridi/comb-ok		0HealthyNone3125 ms2026-10-26T07:55:11.937Zagents-and-memory
Centimeters to inches
io.github.sadri-dridi/cm-to-in		0HealthyNone3132 ms2026-10-26T07:55:11.913Zagents-and-memory
SSE Accept hint
io.github.sadri-dridi/compat-sse		0HealthyNone3120 ms2026-10-26T07:55:11.864Zagents-and-memory
JSON Accept hint
io.github.sadri-dridi/compat-json		0HealthyNone3119 ms2026-10-26T07:55:11.853Zagents-and-memory
colon-separated token count, value discarded
io.github.sadri-dridi/colon-n		0HealthyNone3123 ms2026-10-26T07:55:11.852Zagents-and-memory
Centiliters to liters, number discarded
io.github.sadri-dridi/cl-l		0HealthyNone3143 ms2026-10-26T07:55:11.691Zagents-and-memory
cmd.exe caret-escape count, input discarded
io.github.sadri-dridi/cmd-esc		0HealthyNone3129 ms2026-10-26T07:55:11.685Zagents-and-memory
CSS hex color shape
io.github.sadri-dridi/color-hex-ok		0HealthyNone3138 ms2026-10-26T07:55:11.685Zagents-and-memory
RGB tuple shape
io.github.sadri-dridi/color-rgb-ok		0HealthyNone3137 ms2026-10-26T07:55:11.685Zagents-and-memory
CityHash64 hex length, input discarded
io.github.sadri-dridi/city64-len		0HealthyNone3136 ms2026-10-26T07:55:11.680Zagents-and-memory
CityHash128 hex length, input discarded
io.github.sadri-dridi/city128		0HealthyNone3136 ms2026-10-26T07:55:11.674Zagents-and-memory
Cross-Origin-Embedder-Policy token, value discarded
io.github.sadri-dridi/coep-ok		0HealthyNone3134 ms2026-10-26T07:55:11.668Zagents-and-memory
comma-separated token count, value discarded
io.github.sadri-dridi/comma-n		0HealthyNone3134 ms2026-10-26T07:55:11.658Zagents-and-memory
cid: URL shape, value discarded
io.github.sadri-dridi/cid-url		0HealthyNone3124 ms2026-10-26T07:55:11.644Zagents-and-memory
CIDv1 multibase prefix, value discarded
io.github.sadri-dridi/cid-v1		0HealthyNone3119 ms2026-10-26T07:55:11.644Zagents-and-memory
CIDv0 base58btc Qm, value discarded
io.github.sadri-dridi/cid-base58		0HealthyNone311409 ms2026-10-26T07:55:11.636Zagents-and-memory
COBOL-CASE charset, value discarded
io.github.sadri-dridi/cobol-ok		0HealthyNone3152 ms2026-10-26T07:55:11.488Zagents-and-memory
Clamp n into [min,max], numbers discarded
io.github.sadri-dridi/clamp-ok		0HealthyNone31404 ms2026-10-26T07:55:11.473Zagents-and-memory
UTC century number
io.github.sadri-dridi/century		0HealthyNone31780 ms2026-10-26T07:55:11.430Zagents-and-memory
Java class CAFEBABE, bytes discarded
io.github.sadri-dridi/class-ok		0HealthyNone31111 ms2026-10-26T07:55:11.430Zagents-and-memory
CityHash32 hex length, input discarded
io.github.sadri-dridi/city32		0HealthyNone3118 ms2026-10-26T07:55:11.349Zagents-and-memory
ISO country VC
io.github.sadri-dridi/cc-vc		0HealthyNone311430 ms2026-10-26T07:55:11.175Zagents-and-memory
CIDv0 Qm prefix, value discarded
io.github.sadri-dridi/cid-v0		0HealthyNone311398 ms2026-10-26T07:55:11.171Zagents-and-memory
Cubic feet/min to m3/s, number discarded
io.github.sadri-dridi/cfm-m3s		0HealthyNone31990 ms2026-10-26T07:55:11.161Zagents-and-memory
IPv4 CIDR shape, value discarded
io.github.sadri-dridi/cidr4-ok		0HealthyNone311147 ms2026-10-26T07:55:11.158Zagents-and-memory
CityHash hex length, input discarded
io.github.sadri-dridi/cityhash-len		0HealthyNone31988 ms2026-10-26T07:55:11.158Zagents-and-memory

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