Row

Resolvers

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

Country Max qps Min qps Trend Average
USA 8 025 6 722 7 137
other 4 674 3 799 4 257
Czechia 3 344 2 483 2 957
Germany 3 178 2 352 2 932
Netherlands 1 733 1 111 1 488
Sweden 1 372 1 237 1 301
France 1 124 740 926
China 1 059 757 855
Ireland 1 078 485 794
UK 819 623 744
Singapore 881 621 737
Brazil 895 568 707
India 742 531 649
Russia 509 395 436
Japan 417 313 348
Canada 396 302 339

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

QTYPE Max qps Min qps Trend Average
A 15 162 13 367 14 446
NS 6 069 4 894 5 337
AAAA 3 326 2 658 2 974
DS 2 071 1 712 1 959
MX 838 449 668
other 504 377 452
TXT 379 204 294
SOA 194 102 138
ANY 60 4 16

Traffic flows – average distribution of QPS since 2025-07-23

Authoritative servers

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

City Max QPS Min QPS Trend Average
Frankfurt am Main 5 918 4 690 5 547
Praha 4 756 3 413 4 249
Reston (VA) 3 795 2 555 3 114
London 2 754 2 165 2 494
Seattle (WA) 2 374 1 893 2 150
Singapore 2 178 1 736 1 969
Tokyo 1 658 1 256 1 395
Stockholm 1 377 1 209 1 302
São Paulo 1 263 833 1 007
Wien 968 565 682
Bratislava 714 518 605
Kyiv 516 315 447
undisclosed 474 361 427
Johannesburg 470 373 422
Milano 317 217 257
Los Angeles (CA) 316 173 237
Santiago de Chile 297 107 190
Sydney 145 91 114

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

RCODE Max QPS Min QPS Trend Average
NoError 24 884 20 311 23 152
NXDomain 4 643 3 173 3 445
Refused 52 1 18
FormErr 1 1 0
NotAuth 0 0 0
ServFail 0 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 July 24, 2025)

IPv4
IPv6
Country Domains Servers Domains Servers
Czechia 1 218 433 3 327 1 077 876 1 104
United States 472 213 4 449 169 775 3 346
other 295 475 8 683 194 468 5 049
Sweden 224 162 159 223 120 88
Italy 224 141 240 221 000 41
United Kingdom 153 382 369 120 424 128
Germany 138 168 2 440 70 200 1 029
Slovakia 134 786 338 191 581 60

SLD networks

Location of authoritative DNS servers for second-level domains under .cz – autonomous systems (as of July 24, 2025)

IPv4
IPv6
AS Providers Domains Servers Domains Servers
AS16509 AMAZON-02 291 674 2 306 5 159 2 079
AS208414 WEDOS Internet 263 595 8 263 592 7
AS24806 INTERNET CZ 227 085 130 222 898 31
AS25234 ACTIVE 24 187 489 6 187 493 7
AS29134 Webglobe 137 734 31 136 964 13
AS31034 Aruba 223 634 37 220 866 9
AS48689 Webglobe 127 586 10 126 920 2
other other 1 398 657 17 477 1 036 779 8 697

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].