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21server.com通过本站DNS查询可进行实时DNS检测,能够迅速检测出在不同地区以及不同网络下对域名解析的结果,检测DNS解析是否遭受污染,查看域名污染在全国的分布状况,还能对域名的A记录、CNAME记录、MX记录、NS记录予以查询。
DNS查询结果21server.com2026-10-05 02:02:18
预估消耗 0 检测点,实际消耗以【检测点账单】为准
30

检测节点

响应时间分布 域名污染分布

污染比例:0%

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概览 被污染 (0) 状态码4XX (0) 客户端请求错误(请求的资源不存在、权限不足等) 状态码5XX (0) 服务器故障,处理请求时内部出错无法访问 响应超时 (0)
区域/运营商 响应最快 响应最慢 平均响应
全部 -49ms 贵州贵阳移动1447ms 396.067ms
电信 -49ms 甘肃兰州电信572ms 284.182ms
移动 广东汕头移动179ms 贵州贵阳移动1447ms 467.375ms
联通 辽宁营口联通308ms 广西梧州联通919ms 456.091ms
华东 上海联通320ms 江西宜春移动426ms 390.667ms
华北 -49ms 河北唐山联通453ms 288.167ms
华南 广西南宁电信83ms 广西梧州联通919ms 393.667ms
华中 湖北宜昌联通410ms 湖北鄂州移动448ms 434.333ms
西北 甘肃庆阳移动350ms 甘肃兰州电信572ms 461.333ms
西南 -237ms 贵州贵阳移动1447ms 689ms
东北 -112ms 吉林长春电信387ms 277ms
解析占比
全部 电信 移动 联通 被污染
s.821yo.com.
49.235.137.50
s.821yo.com.
49.235.137.50
DNS查询详情
全部
响应超时 被污染
节点数:/
检测点
运营商 检测节点

解析时间

解析内容 操作
电信 青海
405ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		30	IN	CNAME	s.821yo.com.
s.821yo.com.		30	IN	A	49.235.137.50
;; Query time: 405 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:31 UTC 2026
;; MSG SIZE  rcvd: 445

详情
详情 HTTP PING DNS
电信 黑龙江
112ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		601	IN	CNAME	s.821yo.com.
s.821yo.com.		601	IN	A	49.235.137.50
;; Query time: 112 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 68

详情
详情 HTTP PING DNS
电信 北京
49ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		600	IN	CNAME	s.821yo.com.
s.821yo.com.		597	IN	A	49.235.137.50
;; Query time: 49 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 68

详情
详情 HTTP PING DNS
电信 天津
81ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		600	IN	CNAME	s.821yo.com.
s.821yo.com.		600	IN	A	49.235.137.50
;; Query time: 81 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 445

详情
详情 HTTP PING DNS
电信 西藏
237ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		600	IN	CNAME	s.821yo.com.
s.821yo.com.		600	IN	A	49.235.137.50
;; Query time: 237 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 68

详情
详情 HTTP PING DNS
电信 甘肃兰州
572ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 572 msec
;; SERVER: 202.100.64.68#53(202.100.64.68)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 792
详情
详情 HTTP PING DNS
电信 广西南宁
83ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 83 msec
;; SERVER: 202.103.225.68#53(202.103.225.68)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
电信 吉林长春
387ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 387 msec
;; SERVER: 219.149.194.55#53(219.149.194.55)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
电信 辽宁盘锦
346ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	599	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 346 msec
;; SERVER: 219.148.204.66#53(219.148.204.66)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
电信 宁夏银川
495ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 495 msec
;; SERVER: 202.100.96.68#53(202.100.96.68)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
电信 山西长治
359ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 359 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 792
详情
详情 HTTP PING DNS
移动 吉林
297ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		600	IN	CNAME	s.821yo.com.
s.821yo.com.		600	IN	A	49.235.137.50
;; Query time: 297 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 445

详情
详情 HTTP PING DNS
移动 甘肃庆阳
350ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 350 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Sun Oct 04 18:01:31 UTC 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
移动 广东汕头
179ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	900	IN	CNAME	s.821yo.com.
s.821yo.com.	900	IN	A	49.235.137.50

;; Query time: 179 msec
;; SERVER: 211.136.192.6#53(211.136.192.6)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 792
详情
详情 HTTP PING DNS
移动 贵州贵阳
1447ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 1447 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Mon Oct 05 02:01:31 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
移动 黑龙江绥化
212ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 212 msec
;; SERVER: 127.0.0.11#53(127.0.0.11)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 792
详情
详情 HTTP PING DNS
移动 湖北鄂州
448ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 448 msec
;; SERVER: 211.137.58.20#53(211.137.58.20)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
移动 江西宜春
426ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 426 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 105
详情
详情 HTTP PING DNS
移动 天津
380ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 380 msec
;; SERVER: 211.136.17.107#53(211.136.17.107)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 四川
383ms s.821yo.com.
49.235.137.50[上海腾讯]
21server.com.		1799	IN	CNAME	s.821yo.com.
s.821yo.com.		1800	IN	A	49.235.137.50
;; Query time: 383 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Oct 04 18:01:51 UTC 2026
;; MSG SIZE  rcvd: 79

详情
详情 HTTP PING DNS
联通 福建福州
426ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 426 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 广西梧州
919ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 919 msec
;; SERVER: 192.168.5.30#53(192.168.5.30)
;; WHEN: Mon Oct 05 02:01:36 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 河北唐山
453ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 453 msec
;; SERVER: 202.99.160.68#53(202.99.160.68)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 湖北宜昌
410ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 410 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 湖南邵阳
445ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 445 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 辽宁营口
308ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	597	IN	A	49.235.137.50

;; Query time: 308 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 陕西渭南
552ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 552 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Sun Oct 04 18:01:30 UTC 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 上海
320ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	597	IN	A	49.235.137.50

;; Query time: 320 msec
;; SERVER: 223.5.5.5#53(223.5.5.5)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 天津
407ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 407 msec
;; SERVER: 202.99.96.68#53(202.99.96.68)
;; WHEN: Mon Oct 05 02:01:30 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS
联通 新疆博尔塔拉蒙古自治州
394ms s.821yo.com.
49.235.137.50[上海腾讯]
; <<>> DiG Go <<>> +noall +answer +stats 21server.com
;; global options: +cmd

;; ANSWER SECTION:
21server.com.	600	IN	CNAME	s.821yo.com.
s.821yo.com.	600	IN	A	49.235.137.50

;; Query time: 394 msec
;; SERVER: 119.29.29.29#53(119.29.29.29)
;; WHEN: Mon Oct 05 02:01:43 CST 2026
;; MSG SIZE  rcvd: 94
详情
详情 HTTP PING DNS

查询结果仅供参考,不保证100%准确。

21server.com 优化建议

1、[建议1]:dns测速在线显示解析一致指向上海腾讯节点,建议利用dns测速工具优先查看国内公共dns(如阿里公共dns、百度dns)的响应差异,结合dns测试网站对比杭州移动dns、贵州联通dns等地域表现。
2、[建议2]:dns历史解析记录查询可验证该域名是否曾切换解析,当前dns解析查询在线结果稳定,建议使用dns污染检测工具排查s.821yo.com.这个cname指向的潜在风险,并关注dns解析速度测试中的最快最慢差距。
3、[建议3]:针对dns在线查询中出现的1447ms、919ms等延迟峰值,建议通过dns速度在线测试工具优化dns选优策略,优先采用低延迟的上海移动dns或江苏电信dns,并定期进行dns劫持检测以防异常。

其他工具历史

更新时间 2026-10-05 08:22:02
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