ns.web4u.cz DNS trace

Root zone

These servers manage the DNS root zone

a.root-servers.net

198.41.0.4

AS396566

Anycast IP

2001:503:ba3e::2:30

AS19836

Anycast IP

b.root-servers.net

170.247.170.2

AS394353

Anycast IP

2801:1b8:10::b

AS394353

Anycast IP

c.root-servers.net

192.33.4.12

AS2149

Anycast IP

2001:500:2::c

AS2149

Anycast IP

d.root-servers.net

199.7.91.13

AS10886

Anycast IP

2001:500:2d::d

AS10886

Anycast IP

e.root-servers.net

192.203.230.10

AS21556

Anycast IP

2001:500:a8::e

AS21556

Anycast IP

f.root-servers.net

192.5.5.241

AS3557

Anycast IP

2001:500:2f::f

AS3557

Anycast IP

g.root-servers.net

192.112.36.4

AS5927

Anycast IP

2001:500:12::d0d

AS5927

United States of America

h.root-servers.net

198.97.190.53

AS1508

Anycast IP

2001:500:1::53

AS1508

Anycast IP

i.root-servers.net

192.36.148.17

AS29216

Anycast IP

2001:7fe::53

AS29216

Anycast IP

j.root-servers.net

192.58.128.30

AS396661

Anycast IP

2001:503:c27::2:30

AS396661

Anycast IP

k.root-servers.net

193.0.14.129

AS25152

Anycast IP

2001:7fd::1

AS25152

Anycast IP

l.root-servers.net

199.7.83.42

AS20144

Anycast IP

2001:500:9f::42

AS20144

Anycast IP

m.root-servers.net

202.12.27.33

AS7500

Anycast IP

2001:dc3::35

AS7500

Anycast IP

Inconsistent responses

We queried these DNS servers, but not all of them returned the same response. Select a group to see their response.

25 servers a.root-servers.net./198.41.0.4 a.root-servers.net./2001:503:ba3e:0:0:0:2:30 b.root-servers.net./170.247.170.2 c.root-servers.net./192.33.4.12 c.root-servers.net./2001:500:2:0:0:0:0:c d.root-servers.net./199.7.91.13 d.root-servers.net./2001:500:2d:0:0:0:0:d e.root-servers.net./192.203.230.10 e.root-servers.net./2001:500:a8:0:0:0:0:e f.root-servers.net./192.5.5.241 f.root-servers.net./2001:500:2f:0:0:0:0:f g.root-servers.net./192.112.36.4 g.root-servers.net./2001:500:12:0:0:0:0:d0d h.root-servers.net./198.97.190.53 h.root-servers.net./2001:500:1:0:0:0:0:53 i.root-servers.net./192.36.148.17 i.root-servers.net./2001:7fe:0:0:0:0:0:53 j.root-servers.net./192.58.128.30 j.root-servers.net./2001:503:c27:0:0:0:2:30 k.root-servers.net./193.0.14.129 k.root-servers.net./2001:7fd:0:0:0:0:0:1 l.root-servers.net./199.7.83.42 l.root-servers.net./2001:500:9f:0:0:0:0:42 m.root-servers.net./2001:dc3:0:0:0:0:0:35 m.root-servers.net./202.12.27.33

1 server (timed out) b.root-servers.net./2801:1b8:10:0:0:0:0:b

these servers delegate to

cz.

These servers manage the cz zone

a.ns.nic.cz

194.0.12.1

AS25192

Czechia

2001:678:f::1

AS25192

Czechia

b.ns.nic.cz

194.0.13.1

AS25192

Czechia

2001:678:10::1

AS25192

Czechia

c.ns.nic.cz

194.0.14.1

AS200070

Anycast IP

2001:678:11::1

AS200070

Anycast IP

d.ns.nic.cz

193.29.206.1

AS25192

Czechia

2001:678:1::1

AS25192

Czechia

all servers delegate to

web4u.cz.

These servers manage the web4u.cz zone

ns.web4u.cz

185.14.224.241

AS39790

Czechia

2001:1568:fd::241

AS39790

Czechia

ns2.web4u.cz

85.207.53.12

AS25248

Czechia

2a02:a40:100:28ff::12

AS25248

Czechia

These servers claim authority over the web4u.cz zone, which contains ns.web4u.cz

This server timed out.