`u51.com`

DNSSEC	⚠️ Not signed
A	115.238.29.11^{🇨🇳 CT-HangZhou-IDC115.238.0.0/19 Chinanet-HangZhou-IDC}
NS	`ns3.dnsv4.com` ⭐
		A	2402:4e00:1470:2::10^{🇨🇳 TENCENT-NET-AP2402:4e00:1400::/40}
		A	1.12.0.24^{🇨🇳 TENCENT-NET-AP-CN1.12.0.0/20 ZL-IDC-BOM}
		A	1.12.0.25^{🇨🇳 TENCENT-NET-AP-CN1.12.0.0/20 ZL-IDC-BOM}
		A	1.13.76.53^{🇨🇳 TENCENT-NET-AP1.13.64.0/18}
		A	36.155.149.53^{🇨🇳 CMNET-Jiangsu-AP36.155.144.0/21 CMI (Customer Route)}
		A	43.134.249.54^{🇸🇬 TENCENT-NET-AP-CN43.134.224.0/19 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	124.64.205.153^{🇨🇳 CHINA169-BJ124.64.205.0/24}
		A	125.94.59.153^{🇨🇳 CHINANET-BACKBONE125.88.0.0/13 chinanet Guangdong network}
NS	`ns4.dnsv4.com`
		A	2402:4e00:111:fff::d^{🇨🇳 TENCENT-NET-AP2402:4e00::/35}
		A	1.12.0.23^{🇨🇳 TENCENT-NET-AP-CN1.12.0.0/20 ZL-IDC-BOM}
		A	1.12.0.26^{🇨🇳 TENCENT-NET-AP-CN1.12.0.0/20 ZL-IDC-BOM}
		A	43.130.172.54^{🇸🇬 TENCENT-NET-AP-CN43.130.160.0/19 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	49.7.107.153^{🇨🇳 CHINA-149.7.64.0/18 China Telecom Beijing Co. Ltd.}
		A	101.227.168.53^{🇨🇳 SHANGHAITELECOM101.227.168.0/23 SHIDC}
		A	111.13.203.53^{🇨🇳 CHINAMOBILE-CN111.13.0.0/16 CMI (Customer Route)}
		A	117.135.128.153^{🇨🇳 CHINAMOBILE-CN117.135.128.0/24 CMI (Customer Route)}
			PTR	`(root)`
		A	163.177.5.53^{🇨🇳 UNICOM-GuangZhou-IDC163.177.5.0/24}
		A	220.196.136.53^{🇨🇳 UNICOM-SHFT-IDC220.196.136.0/24}
MX	`mx1.u51.com` ⭐
		A	112.13.67.163^{🇨🇳 CMNET-Zhejiang-AP112.13.67.0/24 CMI (Customer Route)}
MX	`mx.u51.com`⁽¹⁰⁾
		A	115.231.106.198^{🇨🇳 CHINANET-BACKBONE115.224.0.0/12 China Telecom Network}
TXT	`z8bq1gm3vjnmx5cpvm4f3xjn55zps20c`
TXT	`google-site-verification=ZgZnIz5Rn7-dngUN7FgyZP8ZYCPoKdQuzegzcDzs8XE`
TXT	`MS=ms86850027`
TXT	`v=spf1 a mx -all`
TXT	`mpg2hjhyyjn0ckxnq10s3pvs66zs6ycz`
SOA	`ns3.dnsv4.com`enterprise2dnsadmin@dnspod.com serial=1766737143

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1771291435

Subdomains

mx.u51.com

nbcamp.u51.com

payorderservice.u51.com

dapi.u51.com

h5.u51.com

web.u51.com

51nbimg.u51.com

mail.u51.com

nbxlb.u51.com

rploan.u51.com

ssd.u51.com

enniuapi.u51.com

credit.u51.com

crawlerapi.u51.com

www.u51.com

mx1.u51.com

banka.u51.com

ipv6.u51.com

callback.u51.com

gjj.u51.com

nbapi.u51.com

Same first word

u51.cn

u51.org

u51.com

u51.co

u51.de

u51.ru

u51.me

Similar names

u15.nl

u15.tv

u15.de

15u.de

1u5.com

15u.net

u15.dk

u15.info

u15.org

51u.org

u15.com

u15.jp

5u1.info

u15.us

u15.es

u15.ca

51u.net

u15.tokyo

u15.ch

5u1.top

5u1.com

DNS History

11 records (5 active, 6 former)

○NSf1g1ns1.dnspod.net2015-07-04 → 2015-12-25 · 4 obs

● 2015-07-04 23:21:34
● 2015-12-25 00:06:06
○ 2016-03-28 18:20:06
○ 2026-03-12 17:00:08

○NSf1g1ns2.dnspod.net2015-07-04 → 2015-12-25 · 4 obs

● 2015-07-04 23:21:34
● 2015-12-25 00:06:06
○ 2016-03-28 18:20:06
○ 2026-03-12 17:00:08

●NSns3.dnsv4.com2016-03-28 → 2026-03-12 · 3 obs

○ 2015-12-25 00:06:06
● 2016-03-28 18:20:06
● 2026-03-12 17:00:08

●NSns4.dnsv4.com2016-03-28 → 2026-03-12 · 3 obs

○ 2015-12-25 00:06:06
● 2016-03-28 18:20:06
● 2026-03-12 17:00:08

○MXmail.u51.com2015-07-04 → 2015-07-04 · 3 obs

● 2015-07-04 23:21:34
○ 2015-11-08 22:46:44
○ 2026-03-12 17:00:08

●MXmx.u51.com2018-02-02 → 2026-03-12 · 3 obs

○ 2016-09-11 17:39:22
● 2018-02-02 14:48:16
● 2026-03-12 17:00:08

●MXmx1.u51.com2021-06-13 → 2026-03-12 · 3 obs

○ 2018-02-02 14:48:16
● 2021-06-13 00:03:02
● 2026-03-12 17:00:08

○MXmxbiz1.qq.com2015-11-08 → 2016-09-11 · 5 obs

○ 2015-07-04 23:21:34
● 2015-11-08 22:46:44
● 2016-09-11 17:39:22
○ 2018-02-02 14:48:16
○ 2026-03-12 17:00:08

○MXmxbiz2.qq.com2015-11-08 → 2016-09-11 · 5 obs

○ 2015-07-04 23:21:34
● 2015-11-08 22:46:44
● 2016-09-11 17:39:22
○ 2018-02-02 14:48:16
○ 2026-03-12 17:00:08

●A115.238.29.112019-08-13 → 2026-03-12 · 3 obs

○ 2018-02-02 14:48:16
● 2019-08-13 23:43:34
● 2026-03-12 17:00:08

○A183.129.178.1422015-07-04 → 2018-02-02 · 4 obs

● 2015-07-04 23:21:34
● 2018-02-02 14:48:16
○ 2019-08-13 23:43:34
○ 2026-03-12 17:00:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
u51.com	ns3.dnsv4.com, ns4.dnsv4.com	18 records

✅ Authoritative Response

Server: 1.12.0.23

NS records: ns3.dnsv4.com, ns4.dnsv4.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for u51.com (unsigned zone)

⏱️ Timing

Total: 254ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`115.238.29.11`
NS	2	`ns4.dnsv4.com, ns3.dnsv4.com`
MX	2	`mx.u51.com (pri: 5), mx1.u51.com (pri: 10)`
TXT	5	`mpg2hjhyyjn0ckxnq10s3pvs66zs6ycz, z8bq1gm3vjnmx5cpvm4f3xjn55zps20c...`
SOA	1	`ns3.dnsv4.com enterprise2dnsadmin.dnspod`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (ns3.dnsv4.com, ns3.dnsv4.com, ns3.dnsv4.com...)

Analysis

Hierarchy

The parent of mx.u51.com, nbcamp.u51.com, payorderservice.u51.com, dapi.u51.com, h5.u51.com and a few other host names is u51.com.

IP Addresses

u51.com resolves to a single IP: 115.238.29.11.

Other host names, for instance 51emonkey.com, nbxlb.u51.com, enniuapi.u51.com, credit.u51.com and www.u51.com share IP numbers with u51.com.

Name Servers

u51.com has two name servers: ns3.dnsv4.com and ns4.dnsv4.com.

u51.com shares the same name server setup as other domains, for example mama.cn, kwailocallife.com, togothermany.cn, polyv.cn and oppass.cn.

u51.com shares some name servers with other domains, for example duiba.com.cn, huimai123.com, v5ddos.com, itxe.net and panda-assets.com.

These name servers are commonly used with the name servers vip3.alidns.com, vip4.alidns.com, f1g1ns1.dnspod.net, f1g1ns2.dnspod.net, ns3.dnsv3.com and ns4.dnsv3.com.

Host names with ten IP numbers:

ns4.dnsv4.com points to: 2402:4e00:111:fff::d, 1.12.0.23, 1.12.0.26, 43.130.172.54, 49.7.107.153, 101.227.168.53, 111.13.203.53, 117.135.128.153, 163.177.5.53 and 220.196.136.53.

Host names with eight IP numbers:

ns3.dnsv4.com points to: 2402:4e00:1470:2::10, 1.12.0.24, 1.12.0.25, 1.13.76.53, 36.155.149.53, 43.134.249.54, 124.64.205.153 and 125.94.59.153.

Mail Servers

u51.com is served by two mail servers: mx1.u51.com and mx.u51.com.

Host names with a single IP:

mx1.u51.com points to 112.13.67.163

mx.u51.com points to 115.231.106.198

u51.com - robtex.com

u51.com

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