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IPV4 · 失败HTTP 521 · HTTP 错误检测时间: 2026-11-11 18:17 UTC

IPV6 · 失败HTTP 521 · HTTP 错误检测时间: 2026-11-11 18:17 UTC

EVIDENCE

观测证据

握手仅验证采样节点；位图是节点声明，不证明文件可下载。

24h 通告成功率0.0%0 / 84

24h 有效回复率0.0%0 / 84

响应延迟中位数未知实际响应样本

验证节点0近 7 天握手

样本资源0公共样本

位图声明覆盖未知0 份观测

NETWORK

网络归属

归属信息来自公开网络数据，不能精确定位机房。

ASN: AS13335
组织: CLOUDFLARENET - Cloudflare, Inc., US
国家 / 地区: US
缓存更新时间: 2026-11-11 15:42 UTC

LAST 24 HOURS

24 小时探测记录

图和事件表仅显示健康通告；连线不代表持续可用。

绿：成功　红：失败　黄：限流/拒绝　灰：未知或本地不可用。IPv4 与 IPv6 两行各自代表独立探测，时间可能相近。

−24 h现在IPv42026-11-10 21:16:09 UTC · IPv4 · HTTP 错误2026-11-10 21:46:28 UTC · IPv4 · HTTP 错误2026-11-10 22:17:01 UTC · IPv4 · HTTP 错误2026-11-10 22:47:53 UTC · IPv4 · HTTP 错误2026-11-10 23:18:21 UTC · IPv4 · HTTP 错误2026-11-10 23:48:58 UTC · IPv4 · HTTP 错误2026-11-11 00:19:45 UTC · IPv4 · HTTP 错误2026-11-11 00:50:21 UTC · IPv4 · HTTP 错误2026-11-11 01:21:36 UTC · IPv4 · HTTP 错误2026-11-11 01:52:01 UTC · IPv4 · HTTP 错误2026-11-11 02:22:57 UTC · IPv4 · HTTP 错误2026-11-11 02:53:48 UTC · IPv4 · HTTP 错误2026-11-11 03:24:30 UTC · IPv4 · HTTP 错误2026-11-11 03:55:01 UTC · IPv4 · HTTP 错误2026-11-11 04:25:32 UTC · IPv4 · HTTP 错误2026-11-11 04:56:08 UTC · IPv4 · HTTP 错误2026-11-11 05:26:42 UTC · IPv4 · HTTP 错误2026-11-11 05:57:04 UTC · IPv4 · HTTP 错误2026-11-11 06:27:41 UTC · IPv4 · HTTP 错误2026-11-11 06:58:12 UTC · IPv4 · HTTP 错误2026-11-11 07:29:25 UTC · IPv4 · HTTP 错误2026-11-11 08:00:06 UTC · IPv4 · HTTP 错误2026-11-11 08:30:46 UTC · IPv4 · HTTP 错误2026-11-11 09:01:08 UTC · IPv4 · HTTP 错误2026-11-11 09:31:32 UTC · IPv4 · HTTP 错误2026-11-11 10:02:53 UTC · IPv4 · HTTP 错误2026-11-11 10:33:34 UTC · IPv4 · HTTP 错误2026-11-11 11:04:18 UTC · IPv4 · HTTP 错误2026-11-11 11:34:48 UTC · IPv4 · HTTP 错误2026-11-11 12:05:08 UTC · IPv4 · HTTP 错误2026-11-11 12:35:40 UTC · IPv4 · HTTP 错误2026-11-11 13:07:20 UTC · IPv4 · HTTP 错误2026-11-11 13:37:57 UTC · IPv4 · HTTP 错误2026-11-11 14:08:48 UTC · IPv4 · HTTP 错误2026-11-11 14:39:41 UTC · IPv4 · HTTP 错误2026-11-11 15:11:09 UTC · IPv4 · HTTP 错误2026-11-11 15:42:18 UTC · IPv4 · HTTP 错误2026-11-11 16:14:00 UTC · IPv4 · HTTP 错误2026-11-11 16:45:38 UTC · IPv4 · HTTP 错误2026-11-11 17:16:10 UTC · IPv4 · HTTP 错误2026-11-11 17:46:28 UTC · IPv4 · HTTP 错误2026-11-11 18:17:45 UTC · IPv4 · HTTP 错误IPv62026-11-10 21:16:10 UTC · IPv6 · HTTP 错误2026-11-10 21:46:29 UTC · IPv6 · HTTP 错误2026-11-10 22:17:02 UTC · IPv6 · HTTP 错误2026-11-10 22:47:54 UTC · IPv6 · HTTP 错误2026-11-10 23:18:22 UTC · IPv6 · HTTP 错误2026-11-10 23:48:59 UTC · IPv6 · HTTP 错误2026-11-11 00:19:47 UTC · IPv6 · HTTP 错误2026-11-11 00:50:22 UTC · IPv6 · HTTP 错误2026-11-11 01:21:37 UTC · IPv6 · HTTP 错误2026-11-11 01:52:02 UTC · IPv6 · HTTP 错误2026-11-11 02:22:58 UTC · IPv6 · HTTP 错误2026-11-11 02:53:49 UTC · IPv6 · HTTP 错误2026-11-11 03:24:31 UTC · IPv6 · HTTP 错误2026-11-11 03:55:03 UTC · IPv6 · HTTP 错误2026-11-11 04:25:34 UTC · IPv6 · HTTP 错误2026-11-11 04:56:10 UTC · IPv6 · HTTP 错误2026-11-11 05:26:43 UTC · IPv6 · HTTP 错误2026-11-11 05:57:06 UTC · IPv6 · HTTP 错误2026-11-11 06:27:42 UTC · IPv6 · HTTP 错误2026-11-11 06:58:14 UTC · IPv6 · HTTP 错误2026-11-11 07:29:28 UTC · IPv6 · HTTP 错误2026-11-11 08:00:07 UTC · IPv6 · HTTP 错误2026-11-11 08:30:47 UTC · IPv6 · HTTP 错误2026-11-11 09:01:10 UTC · IPv6 · HTTP 错误2026-11-11 09:31:33 UTC · IPv6 · HTTP 错误2026-11-11 10:02:55 UTC · IPv6 · HTTP 错误2026-11-11 10:33:35 UTC · IPv6 · HTTP 错误2026-11-11 11:04:20 UTC · IPv6 · HTTP 错误2026-11-11 11:34:49 UTC · IPv6 · HTTP 错误2026-11-11 12:05:09 UTC · IPv6 · HTTP 错误2026-11-11 12:35:41 UTC · IPv6 · HTTP 错误2026-11-11 13:07:21 UTC · IPv6 · HTTP 错误2026-11-11 13:37:58 UTC · IPv6 · HTTP 错误2026-11-11 14:08:49 UTC · IPv6 · HTTP 错误2026-11-11 14:39:42 UTC · IPv6 · HTTP 错误2026-11-11 15:11:11 UTC · IPv6 · HTTP 错误2026-11-11 15:42:19 UTC · IPv6 · HTTP 错误2026-11-11 16:14:01 UTC · IPv6 · HTTP 错误2026-11-11 16:45:39 UTC · IPv6 · HTTP 错误2026-11-11 17:16:11 UTC · IPv6 · HTTP 错误2026-11-11 17:46:29 UTC · IPv6 · HTTP 错误2026-11-11 18:17:47 UTC · IPv6 · HTTP 错误

实测响应延迟 (ms)

12410−24 h现在2026-11-10 21:16 UTC · IPV4 · HTTP 错误 · 204 ms2026-11-10 21:46 UTC · IPV4 · HTTP 错误 · 192 ms2026-11-10 22:17 UTC · IPV4 · HTTP 错误 · 188 ms2026-11-10 22:47 UTC · IPV4 · HTTP 错误 · 182 ms2026-11-10 23:18 UTC · IPV4 · HTTP 错误 · 206 ms2026-11-10 23:48 UTC · IPV4 · HTTP 错误 · 267 ms2026-11-11 00:19 UTC · IPV4 · HTTP 错误 · 194 ms2026-11-11 00:50 UTC · IPV4 · HTTP 错误 · 199 ms2026-11-11 01:21 UTC · IPV4 · HTTP 错误 · 194 ms2026-11-11 01:52 UTC · IPV4 · HTTP 错误 · 206 ms2026-11-11 02:22 UTC · IPV4 · HTTP 错误 · 215 ms2026-11-11 02:53 UTC · IPV4 · HTTP 错误 · 188 ms2026-11-11 03:24 UTC · IPV4 · HTTP 错误 · 234 ms2026-11-11 03:55 UTC · IPV4 · HTTP 错误 · 547 ms2026-11-11 04:25 UTC · IPV4 · HTTP 错误 · 205 ms2026-11-11 04:56 UTC · IPV4 · HTTP 错误 · 199 ms2026-11-11 05:26 UTC · IPV4 · HTTP 错误 · 185 ms2026-11-11 05:57 UTC · IPV4 · HTTP 错误 · 193 ms2026-11-11 06:27 UTC · IPV4 · HTTP 错误 · 184 ms2026-11-11 06:58 UTC · IPV4 · HTTP 错误 · 210 ms2026-11-11 07:29 UTC · IPV4 · HTTP 错误 · 183 ms2026-11-11 08:00 UTC · IPV4 · HTTP 错误 · 201 ms2026-11-11 08:30 UTC · IPV4 · HTTP 错误 · 192 ms2026-11-11 09:01 UTC · IPV4 · HTTP 错误 · 192 ms2026-11-11 09:31 UTC · IPV4 · HTTP 错误 · 180 ms2026-11-11 10:02 UTC · IPV4 · HTTP 错误 · 179 ms2026-11-11 10:33 UTC · IPV4 · HTTP 错误 · 181 ms2026-11-11 11:04 UTC · IPV4 · HTTP 错误 · 183 ms2026-11-11 11:34 UTC · IPV4 · HTTP 错误 · 174 ms2026-11-11 12:05 UTC · IPV4 · HTTP 错误 · 180 ms2026-11-11 12:35 UTC · IPV4 · HTTP 错误 · 184 ms2026-11-11 13:07 UTC · IPV4 · HTTP 错误 · 197 ms2026-11-11 13:37 UTC · IPV4 · HTTP 错误 · 187 ms2026-11-11 14:08 UTC · IPV4 · HTTP 错误 · 193 ms2026-11-11 14:39 UTC · IPV4 · HTTP 错误 · 177 ms2026-11-11 15:11 UTC · IPV4 · HTTP 错误 · 221 ms2026-11-11 15:42 UTC · IPV4 · HTTP 错误 · 183 ms2026-11-11 16:14 UTC · IPV4 · HTTP 错误 · 236 ms2026-11-11 16:45 UTC · IPV4 · HTTP 错误 · 225 ms2026-11-11 17:16 UTC · IPV4 · HTTP 错误 · 206 ms2026-11-11 17:46 UTC · IPV4 · HTTP 错误 · 211 ms2026-11-11 18:17 UTC · IPV4 · HTTP 错误 · 194 ms2026-11-10 21:16 UTC · IPV6 · HTTP 错误 · 211 ms2026-11-10 21:46 UTC · IPV6 · HTTP 错误 · 178 ms2026-11-10 22:17 UTC · IPV6 · HTTP 错误 · 182 ms2026-11-10 22:47 UTC · IPV6 · HTTP 错误 · 189 ms2026-11-10 23:18 UTC · IPV6 · HTTP 错误 · 201 ms2026-11-10 23:48 UTC · IPV6 · HTTP 错误 · 180 ms2026-11-11 00:19 UTC · IPV6 · HTTP 错误 · 202 ms2026-11-11 00:50 UTC · IPV6 · HTTP 错误 · 199 ms2026-11-11 01:21 UTC · IPV6 · HTTP 错误 · 240 ms2026-11-11 01:52 UTC · IPV6 · HTTP 错误 · 215 ms2026-11-11 02:22 UTC · IPV6 · HTTP 错误 · 268 ms2026-11-11 02:53 UTC · IPV6 · HTTP 错误 · 180 ms2026-11-11 03:24 UTC · IPV6 · HTTP 错误 · 213 ms2026-11-11 03:55 UTC · IPV6 · HTTP 错误 · 220 ms2026-11-11 04:25 UTC · IPV6 · HTTP 错误 · 203 ms2026-11-11 04:56 UTC · IPV6 · HTTP 错误 · 186 ms2026-11-11 05:26 UTC · IPV6 · HTTP 错误 · 196 ms2026-11-11 05:57 UTC · IPV6 · HTTP 错误 · 193 ms2026-11-11 06:27 UTC · IPV6 · HTTP 错误 · 185 ms2026-11-11 06:58 UTC · IPV6 · HTTP 错误 · 189 ms2026-11-11 07:29 UTC · IPV6 · HTTP 错误 · 1241 ms2026-11-11 08:00 UTC · IPV6 · HTTP 错误 · 184 ms2026-11-11 08:30 UTC · IPV6 · HTTP 错误 · 198 ms2026-11-11 09:01 UTC · IPV6 · HTTP 错误 · 181 ms2026-11-11 09:31 UTC · IPV6 · HTTP 错误 · 198 ms2026-11-11 10:02 UTC · IPV6 · HTTP 错误 · 1198 ms2026-11-11 10:33 UTC · IPV6 · HTTP 错误 · 187 ms2026-11-11 11:04 UTC · IPV6 · HTTP 错误 · 179 ms2026-11-11 11:34 UTC · IPV6 · HTTP 错误 · 185 ms2026-11-11 12:05 UTC · IPV6 · HTTP 错误 · 190 ms2026-11-11 12:35 UTC · IPV6 · HTTP 错误 · 177 ms2026-11-11 13:07 UTC · IPV6 · HTTP 错误 · 173 ms2026-11-11 13:37 UTC · IPV6 · HTTP 错误 · 386 ms2026-11-11 14:08 UTC · IPV6 · HTTP 错误 · 182 ms2026-11-11 14:39 UTC · IPV6 · HTTP 错误 · 186 ms2026-11-11 15:11 UTC · IPV6 · HTTP 错误 · 191 ms2026-11-11 15:42 UTC · IPV6 · HTTP 错误 · 175 ms2026-11-11 16:14 UTC · IPV6 · HTTP 错误 · 189 ms2026-11-11 16:45 UTC · IPV6 · HTTP 错误 · 223 ms2026-11-11 17:16 UTC · IPV6 · HTTP 错误 · 214 ms2026-11-11 17:46 UTC · IPV6 · HTTP 错误 · 188 ms2026-11-11 18:17 UTC · IPV6 · HTTP 错误 · 175 ms

时间 (UTC)	地址族	阶段	传输	观测结果	有效 Tracker 回复	阶段延迟	原因
2026-11-11 18:17 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	175 ms	http_error
2026-11-11 18:17 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	194 ms	http_error
2026-11-11 17:46 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	188 ms	http_error
2026-11-11 17:46 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	211 ms	http_error
2026-11-11 17:16 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	214 ms	http_error
2026-11-11 17:16 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	206 ms	http_error
2026-11-11 16:45 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	223 ms	http_error
2026-11-11 16:45 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	225 ms	http_error
2026-11-11 16:14 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	189 ms	http_error
2026-11-11 16:14 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	236 ms	http_error
2026-11-11 15:42 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	175 ms	http_error
2026-11-11 15:42 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	183 ms	http_error
2026-11-11 15:11 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	191 ms	http_error
2026-11-11 15:11 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	221 ms	http_error
2026-11-11 14:39 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	186 ms	http_error
2026-11-11 14:39 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	177 ms	http_error
2026-11-11 14:08 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	182 ms	http_error
2026-11-11 14:08 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	193 ms	http_error
2026-11-11 13:37 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	386 ms	http_error
2026-11-11 13:37 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	187 ms	http_error
2026-11-11 13:07 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	173 ms	http_error
2026-11-11 13:07 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	197 ms	http_error
2026-11-11 12:35 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	177 ms	http_error
2026-11-11 12:35 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	184 ms	http_error
2026-11-11 12:05 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	190 ms	http_error
2026-11-11 12:05 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	180 ms	http_error
2026-11-11 11:34 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	185 ms	http_error
2026-11-11 11:34 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	174 ms	http_error
2026-11-11 11:04 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	179 ms	http_error
2026-11-11 11:04 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	183 ms	http_error
2026-11-11 10:33 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	187 ms	http_error
2026-11-11 10:33 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	181 ms	http_error
2026-11-11 10:02 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	1198 ms	http_error
2026-11-11 10:02 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	179 ms	http_error
2026-11-11 09:31 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	198 ms	http_error
2026-11-11 09:31 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	180 ms	http_error
2026-11-11 09:01 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	181 ms	http_error
2026-11-11 09:01 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	192 ms	http_error
2026-11-11 08:30 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	198 ms	http_error
2026-11-11 08:30 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	192 ms	http_error
2026-11-11 08:00 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	184 ms	http_error
2026-11-11 08:00 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	201 ms	http_error
2026-11-11 07:29 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	1241 ms	http_error
2026-11-11 07:29 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	183 ms	http_error
2026-11-11 06:58 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	189 ms	http_error
2026-11-11 06:58 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	210 ms	http_error
2026-11-11 06:27 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	185 ms	http_error
2026-11-11 06:27 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	184 ms	http_error
2026-11-11 05:57 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	193 ms	http_error
2026-11-11 05:57 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	193 ms	http_error
2026-11-11 05:26 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	196 ms	http_error
2026-11-11 05:26 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	185 ms	http_error
2026-11-11 04:56 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	186 ms	http_error
2026-11-11 04:56 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	199 ms	http_error
2026-11-11 04:25 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	203 ms	http_error
2026-11-11 04:25 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	205 ms	http_error
2026-11-11 03:55 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	220 ms	http_error
2026-11-11 03:55 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	547 ms	http_error
2026-11-11 03:24 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	213 ms	http_error
2026-11-11 03:24 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	234 ms	http_error
2026-11-11 02:53 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	180 ms	http_error
2026-11-11 02:53 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	188 ms	http_error
2026-11-11 02:22 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	268 ms	http_error
2026-11-11 02:22 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	215 ms	http_error
2026-11-11 01:52 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	215 ms	http_error
2026-11-11 01:52 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	206 ms	http_error
2026-11-11 01:21 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	240 ms	http_error
2026-11-11 01:21 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	194 ms	http_error
2026-11-11 00:50 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	199 ms	http_error
2026-11-11 00:50 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	199 ms	http_error
2026-11-11 00:19 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	202 ms	http_error
2026-11-11 00:19 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	194 ms	http_error
2026-11-10 23:48 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	180 ms	http_error
2026-11-10 23:48 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	267 ms	http_error
2026-11-10 23:18 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	201 ms	http_error
2026-11-10 23:18 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	206 ms	http_error
2026-11-10 22:47 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	189 ms	http_error
2026-11-10 22:47 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	182 ms	http_error
2026-11-10 22:17 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	182 ms	http_error
2026-11-10 22:17 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	188 ms	http_error
2026-11-10 21:46 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	178 ms	http_error
2026-11-10 21:46 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	192 ms	http_error
2026-11-10 21:16 UTC	IPV6	健康通告	HTTP 521	HTTP 错误	否	211 ms	http_error
2026-11-10 21:16 UTC	IPV4	健康通告	HTTP 521	HTTP 错误	否	204 ms	http_error

观测来自单一网络位置；缺测和探针本地故障不等于 Tracker 离线。