Row

Resolvers

Country analysis – daily QPS averages for queries originating from resolvers in a given country during the last 30 days before September 18, 2025

Country Max qps Min qps Trend Average
USA 8 710 6 502 7 156
other 5 570 3 905 4 581
Germany 3 597 2 597 3 193
Czechia 3 569 2 463 3 072
Netherlands 2 042 1 387 1 743
Sweden 1 523 1 182 1 345
Brazil 2 139 801 1 116
China 1 111 776 907
France 1 093 746 904
Singapore 1 152 697 851
UK 910 624 801
Ireland 1 179 495 800
India 836 441 588
Russia 744 344 447
Japan 420 310 338
Canada 392 287 337

Query type analysis – daily QPS averages for queries with a given QTYPE during the last 30 days before September 18, 2025

QTYPE Max qps Min qps Trend Average
A 16 457 13 706 15 182
NS 6 818 4 996 5 634
AAAA 3 613 2 804 3 153
DS 2 725 1 926 2 177
MX 998 468 689
other 576 293 428
TXT 452 194 305
DNSKEY 845 224 278

Traffic flows – average distribution of QPS since 2025-09-11

Authoritative servers

Server analysis – daily QPS averages for queries reaching an authoritative server in a given city during the last 30 days before September 18, 2025

City Max QPS Min QPS Trend Average
Frankfurt am Main 7 197 5 658 6 588
Praha 5 309 3 290 4 589
Reston (VA) 3 509 2 863 3 142
Singapore 2 703 1 925 2 204
Seattle (WA) 2 263 1 878 2 075
Tokyo 3 307 1 366 1 910
London 1 696 1 361 1 520
Stockholm 1 497 1 184 1 353
São Paulo 2 269 995 1 339
Bratislava 717 554 639
Wien 708 557 638
Kyiv 701 390 570
Johannesburg 555 404 476
undisclosed 492 361 423
Milano 396 217 287
Santiago de Chile 228 104 155
Los Angeles (CA) 346 89 152
Sydney 158 104 120

Response code analysis – daily QPS averages for queries responded with a given RCODE during the last 30 days before September 18, 2025

RCODE Max QPS Min QPS Trend Average
NoError 26 795 21 939 24 678
NXDomain 4 179 3 062 3 493
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 11, 2025)

IPv4
IPv6
Country Domains Servers Domains Servers
Czechia 1 225 356 3 315 1 082 625 1 113
United States 476 299 4 422 172 972 3 346
other 291 183 8 662 195 639 5 038
Italy 225 451 240 222 311 41
Sweden 225 091 161 223 955 91
United Kingdom 154 544 376 121 267 130
Slovakia 144 741 338 196 481 60
Germany 140 061 2 423 71 504 1 015

SLD networks

Location of authoritative DNS servers for second-level domains under .cz – autonomous systems (as of September 11, 2025)

IPv4
IPv6
AS Providers Domains Servers Domains Servers
AS16509 AMAZON-02 291 045 2 302 5 185 2 078
AS208414 WEDOS Internet 265 442 11 265 437 7
AS24806 INTERNET CZ 228 377 128 224 191 33
AS25234 ACTIVE 24 188 002 6 188 006 7
AS29134 Webglobe 137 668 29 136 902 11
AS31034 Aruba 224 949 38 222 177 9
AS48689 Webglobe 133 710 9 136 848 2
other other 1 395 674 17 414 1 037 518 8 687

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].