Row

Resolvers

Country analysis – daily QPS averages for queries originating from resolvers in a given country during the last 30 days before September 20, 2025

Country Max qps Min qps Trend Average
USA 8 710 6 502 7 149
other 5 570 3 905 4 557
Germany 3 597 2 597 3 179
Czechia 3 569 1 785 3 028
Netherlands 2 042 1 387 1 727
Sweden 1 523 1 187 1 343
Brazil 1 646 801 1 067
China 1 111 776 918
France 1 093 636 887
Singapore 1 152 697 861
UK 910 624 797
Ireland 1 179 399 786
India 836 441 575
Russia 744 344 452
Japan 420 303 336
Canada 392 287 335

Query type analysis – daily QPS averages for queries with a given QTYPE during the last 30 days before September 20, 2025

QTYPE Max qps Min qps Trend Average
A 16 457 13 442 15 079
NS 6 818 4 996 5 616
AAAA 3 409 2 742 3 121
DS 2 725 1 804 2 146
MX 998 468 690
other 576 293 428
TXT 452 194 301
DNSKEY 845 224 277

Traffic flows – average distribution of QPS since 2025-09-13

Authoritative servers

Server analysis – daily QPS averages for queries reaching an authoritative server in a given city during the last 30 days before September 20, 2025

City Max QPS Min QPS Trend Average
Frankfurt am Main 7 197 5 658 6 577
Praha 5 309 1 682 4 480
Reston (VA) 3 509 2 863 3 149
Singapore 2 703 1 925 2 183
Seattle (WA) 2 263 1 878 2 068
Tokyo 3 307 1 366 1 890
London 1 696 1 361 1 520
Stockholm 1 497 1 202 1 357
São Paulo 1 777 995 1 301
Bratislava 717 554 641
Wien 708 557 637
Kyiv 701 390 573
Johannesburg 555 404 472
undisclosed 492 361 423
Milano 396 217 290
Los Angeles (CA) 353 89 165
Santiago de Chile 218 104 151
Sydney 158 104 118

Response code analysis – daily QPS averages for queries responded with a given RCODE during the last 30 days before September 20, 2025

RCODE Max QPS Min QPS Trend Average
NoError 26 795 21 939 24 501
NXDomain 4 179 3 062 3 483
Refused 63 1 17
FormErr 1 0 0
NotAuth 0 0 0
ServFail 1 0 0
NotImp 0 0 0
BADSIG 0 0 0
BADVERS 0 0 0

Row

IP version

Traffic rate by IP version – time series of daily QPS averages for IPv4 and IPv6

Protocol

Traffic rate by transport protocol – time series of daily QPS averages for UDP and TCP

SLD countries

Location of authoritative DNS servers for second-level domains under .cz – countries (as of September 18, 2025)

IPv4
IPv6
Country Domains Servers Domains Servers
Czechia 1 225 265 3 313 1 082 980 1 109
United States 476 513 4 409 172 866 3 342
other 290 076 8 662 195 606 5 054
Italy 225 618 241 222 480 41
Sweden 225 076 160 223 942 91
United Kingdom 154 584 379 121 247 130
Slovakia 140 997 339 191 654 61
Germany 139 971 2 428 75 363 1 021

SLD networks

Location of authoritative DNS servers for second-level domains under .cz – autonomous systems (as of September 18, 2025)

IPv4
IPv6
AS Providers Domains Servers Domains Servers
AS16509 AMAZON-02 291 249 2 297 5 184 2 077
AS208414 WEDOS Internet 265 299 11 265 294 7
AS24806 INTERNET CZ 228 566 129 224 385 34
AS25234 ACTIVE 24 188 148 6 188 152 7
AS29134 Webglobe 137 706 29 136 940 11
AS31034 Aruba 225 143 39 222 374 10
AS48689 Webglobe 133 753 9 133 092 1
other other 1 393 783 17 411 1 039 800 8 702

Catchment areas

Mapping of countries to a destination DNS server that receives most of the traffic from a given country.

DNSSEC

Traffic rate by DNSSEC – time series of daily QPS averages by DNSSEC support
Whether a DNS query supports DNSSEC or not is determined from the EDNS0 flag DNSSEC OK (DO) [RFC 3225].