We track 59133 servers from the official MCP Registry. 40018 are hosted (remote); we have health-checked 39686 so far. 343 use templated URLs that need user-specific values and can't be checked. Of those checked, 23734 passed a full MCP handshake, 11763 are up but need credentials, and 4189 failed or were unreachable (last check 2026-11-08T10:05:23.165Z UTC). How we check.
| Server | Users (30 d) | Handshake | Auth | Tools | Latency | Last checked (UTC) | Category |
|---|---|---|---|---|---|---|---|
| UTC ISO ordinal YYYY-DDD shape io.github.sadri-dridi/iso-ord2 | 0 | Healthy | None | 31 | 14 ms | 2026-11-06T17:40:43.695Z | agents-and-memory |
| UTC ISO weekday 1-7 io.github.sadri-dridi/iso-wd | 0 | Healthy | None | 31 | 18 ms | 2026-11-06T17:40:43.674Z | agents-and-memory |
| ISBN digit shape io.github.sadri-dridi/isbn-shape | 0 | Healthy | None | 31 | 16 ms | 2026-11-06T17:40:43.508Z | agents-and-memory |
| Container image tag charset, name discarded io.github.sadri-dridi/image-tag-ok | 0 | Healthy | None | 31 | 14 ms | 2026-11-06T17:40:43.404Z | ai-and-media |
| ISBN-13 digit shape, value discarded io.github.sadri-dridi/isbn13-ok | 0 | Healthy | None | 31 | 329 ms | 2026-11-06T17:40:43.383Z | agents-and-memory |
| ISO 8601 duration shape io.github.sadri-dridi/iso-duration | 0 | Healthy | None | 31 | 12 ms | 2026-11-06T17:40:43.335Z | agents-and-memory |
| UTC ISO ordinal date YYYY-DDD io.github.sadri-dridi/iso-ord | 0 | Healthy | None | 31 | 12 ms | 2026-11-06T17:40:43.301Z | agents-and-memory |
| ISBN URN shape, value discarded io.github.sadri-dridi/isbn-uri | 0 | Healthy | None | 31 | 24 ms | 2026-11-06T17:40:43.284Z | agents-and-memory |
| IRI scheme shape, value discarded io.github.sadri-dridi/iri-ok | 0 | Healthy | None | 31 | 33 ms | 2026-11-06T17:40:43.281Z | agents-and-memory |
| IPv4 shape, address discarded io.github.sadri-dridi/ipv4-ok | 0 | Healthy | None | 31 | 33 ms | 2026-11-06T17:40:43.277Z | agents-and-memory |
| ISBN-10 digit shape, value discarded io.github.sadri-dridi/isbn10-ok | 0 | Healthy | None | 31 | 260 ms | 2026-11-06T17:40:43.275Z | agents-and-memory |
| Instagram-style shard id shape, value discarded io.github.sadri-dridi/instagram-id | 0 | Healthy | None | 31 | 255 ms | 2026-11-06T17:40:43.266Z | marketing-and-seo |
| Amazon Ion version marker, body discarded io.github.sadri-dridi/ion-ok | 0 | Healthy | None | 31 | 52 ms | 2026-11-06T17:40:43.264Z | agents-and-memory |
| ISNI 16-digit shape, value discarded io.github.sadri-dridi/isni-ok | 0 | Healthy | None | 31 | 141 ms | 2026-11-06T17:40:43.261Z | agents-and-memory |
| Indian national year band io.github.sadri-dridi/indian-ok | 0 | Healthy | None | 31 | 434 ms | 2026-11-06T17:40:43.259Z | agents-and-memory |
| Whether Islamic year is leap io.github.sadri-dridi/islamic-leap | 0 | Healthy | None | 31 | 157 ms | 2026-11-06T17:40:43.257Z | agents-and-memory |
| inHg to kilopascals, number discarded io.github.sadri-dridi/inhg-kpa | 0 | Healthy | None | 31 | 348 ms | 2026-11-06T17:40:43.256Z | agents-and-memory |
| Intel HEX type-00 count, input discarded io.github.sadri-dridi/ihex-ok | 0 | Healthy | None | 31 | 19 ms | 2026-11-06T17:35:46.060Z | agents-and-memory |
| IPv4 or IPv6, address discarded io.github.sadri-dridi/ip-version | 0 | Healthy | None | 31 | 16 ms | 2026-11-06T17:35:46.056Z | agents-and-memory |
| Whether Indian national year is leap io.github.sadri-dridi/indian-leap | 0 | Healthy | None | 31 | 14 ms | 2026-11-06T17:35:46.054Z | agents-and-memory |
| INI section count, values discarded io.github.sadri-dridi/ini-sections | 0 | Healthy | None | 31 | 14 ms | 2026-11-06T17:35:46.054Z | agents-and-memory |
| IPv6 shape, address discarded io.github.sadri-dridi/ipv6-ok | 0 | Healthy | None | 31 | 14 ms | 2026-11-06T17:35:46.053Z | agents-and-memory |
| Inches to centimeters io.github.sadri-dridi/in-to-cm | 0 | Healthy | None | 31 | 18 ms | 2026-11-06T17:35:46.022Z | agents-and-memory |
| Python identifier charset, value discarded io.github.sadri-dridi/ident-py | 0 | Healthy | None | 31 | 13 ms | 2026-11-06T17:35:46.014Z | agents-and-memory |
| info: URI namespace shape, value discarded io.github.sadri-dridi/info-uri | 0 | Healthy | None | 31 | 15 ms | 2026-11-06T17:35:45.847Z | agents-and-memory |
| HTTP 511 network-auth io.github.sadri-dridi/http-511 | 0 | Healthy | None | 31 | 28 ms | 2026-11-06T17:35:45.828Z | agents-and-memory |
| INI key count, values discarded io.github.sadri-dridi/ini-keys-ok | 0 | Healthy | None | 31 | 28 ms | 2026-11-06T17:35:45.828Z | agents-and-memory |
| IGES start-section check, file discarded io.github.sadri-dridi/iges-ok | 0 | Healthy | None | 31 | 33 ms | 2026-11-06T17:35:45.823Z | agents-and-memory |
| IMF header unfold count, input discarded io.github.sadri-dridi/imf-ok | 0 | Healthy | None | 31 | 26 ms | 2026-11-06T17:35:45.823Z | agents-and-memory |
| If-None-Match star-or-etag, value discarded io.github.sadri-dridi/if-none-ok | 0 | Healthy | None | 31 | 28 ms | 2026-11-06T17:35:45.820Z | agents-and-memory |
| Tabs vs spaces indent, text discarded io.github.sadri-dridi/indent-kind | 0 | Healthy | None | 31 | 30 ms | 2026-11-06T17:35:45.820Z | agents-and-memory |
| If-Range etag-or-date shape, value discarded io.github.sadri-dridi/if-range-ok | 0 | Healthy | None | 31 | 25 ms | 2026-11-06T17:35:45.819Z | agents-and-memory |
| If-Match etag list count, value discarded io.github.sadri-dridi/if-match-ok | 0 | Healthy | None | 31 | 23 ms | 2026-11-06T17:35:45.818Z | agents-and-memory |
| If-Modified-Since HTTP-date, value discarded io.github.sadri-dridi/if-mod-ok | 0 | Healthy | None | 31 | 23 ms | 2026-11-06T17:35:45.816Z | agents-and-memory |
| MSSQL IDENTITY integer band, value discarded io.github.sadri-dridi/identity-mssql | 0 | Healthy | None | 31 | 22 ms | 2026-11-06T17:35:45.811Z | agents-and-memory |
| IANA Zones io.github.sadri-dridi/iana-zones | 0 | Healthy | None | 31 | 22 ms | 2026-11-06T17:35:45.809Z | agents-and-memory |
| UTC last day of the current half-year io.github.sadri-dridi/hy-end | 0 | Healthy | None | 31 | 19 ms | 2026-11-06T17:35:45.807Z | agents-and-memory |
| INI section count, body discarded io.github.sadri-dridi/ini-ok | 0 | Healthy | None | 31 | 12 ms | 2026-11-06T17:35:45.794Z | agents-and-memory |
| If-Unmodified-Since HTTP-date, value discarded io.github.sadri-dridi/if-unmod-ok | 0 | Healthy | None | 31 | 13 ms | 2026-11-06T17:35:45.790Z | agents-and-memory |
| HTTP 501 not-implemented io.github.sadri-dridi/http-501 | 0 | Healthy | None | 31 | 570 ms | 2026-11-06T17:35:45.546Z | agents-and-memory |
| HZ-GB ~{ ~} frame, input discarded io.github.sadri-dridi/hz-gb-ok | 0 | Healthy | None | 31 | 545 ms | 2026-11-06T17:35:45.546Z | agents-and-memory |
| iCalendar shape, body discarded io.github.sadri-dridi/ical-ok | 0 | Healthy | None | 31 | 896 ms | 2026-11-06T17:35:45.546Z | agents-and-memory |
| iCalendar VEVENT count, body discarded io.github.sadri-dridi/ics-ok | 0 | Healthy | None | 31 | 561 ms | 2026-11-06T17:35:45.546Z | agents-and-memory |
| HTTP 451 unavailable-legal io.github.sadri-dridi/http-451 | 0 | Healthy | None | 31 | 1038 ms | 2026-11-06T17:35:45.540Z | agents-and-memory |
| IATA airport code shape io.github.sadri-dridi/iata-ok | 0 | Healthy | None | 31 | 843 ms | 2026-11-06T17:35:45.540Z | agents-and-memory |
| ICAO airport code shape io.github.sadri-dridi/icao-ok | 0 | Healthy | None | 31 | 569 ms | 2026-11-06T17:35:45.540Z | agents-and-memory |
| programming identifier charset, value discarded io.github.sadri-dridi/ident-ok | 0 | Healthy | None | 31 | 541 ms | 2026-11-06T17:35:45.540Z | agents-and-memory |
| IDNA label length band, host discarded io.github.sadri-dridi/idna-ok | 0 | Healthy | None | 31 | 969 ms | 2026-11-06T17:35:45.540Z | agents-and-memory |
| HTTP 431 header-fields-too-large io.github.sadri-dridi/http-431 | 0 | Healthy | None | 31 | 1040 ms | 2026-11-06T17:35:45.536Z | agents-and-memory |
| ICO magic-byte check, file discarded io.github.sadri-dridi/ico-magic | 0 | Healthy | None | 30 | 984 ms | 2026-11-06T17:35:45.536Z | agents-and-memory |
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