Row

Resolvers

Country analysis – daily QPS averages for queries originating from resolvers in a given country during the last 30 days before April 24, 2025

Country Max qps Min qps Trend Average
USA 7 374 6 253 6 755
other 5 317 3 523 3 968
Czechia 3 590 2 503 3 051
Germany 3 358 2 332 2 881
Netherlands 1 784 1 017 1 437
Sweden 1 202 737 1 123
France 1 002 720 874
Singapore 1 047 639 835
Ireland 1 092 439 768
China 1 033 566 716
UK 709 519 621
Russia 566 396 463
India 821 339 435
Brazil 599 363 432
Finland 917 254 360
Italy 593 227 304

Query type analysis – daily QPS averages for queries with a given QTYPE during the last 30 days before April 24, 2025

QTYPE Max qps Min qps Trend Average
A 14 623 11 774 13 417
NS 8 146 4 357 4 971
AAAA 3 063 2 411 2 778
DS 2 122 1 707 1 921
MX 871 431 681
other 520 402 469
TXT 400 204 299
SOA 217 93 140

Traffic flows – average distribution of QPS since 2025-04-17

Authoritative servers

Server analysis – daily QPS averages for queries reaching an authoritative server in a given city during the last 30 days before April 24, 2025

City Max QPS Min QPS Trend Average
Frankfurt am Main 6 505 4 269 5 316
Praha 5 064 3 359 4 306
Reston (VA) 3 436 2 159 2 619
London 2 810 2 152 2 519
Seattle (WA) 2 421 1 917 2 205
Singapore 2 774 1 631 2 018
Tokyo 1 502 1 039 1 142
Stockholm 1 382 761 1 077
São Paulo 986 643 718
Bratislava 768 483 591
Kyiv 679 346 529
Wien 630 439 519
undisclosed 569 427 514
Johannesburg 376 178 260
Milano 479 180 238
Santiago de Chile 261 68 209
Los Angeles (CA) 209 98 150
Sydney 115 59 93

Response code analysis – daily QPS averages for queries responded with a given RCODE during the last 30 days before April 24, 2025

RCODE Max QPS Min QPS Trend Average
NoError 26 182 18 989 21 840
NXDomain 3 560 2 826 3 171
Refused 72 2 18
FormErr 1 0 0
ServFail 0 0 0
NotAuth 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 April 17, 2025)

IPv4
IPv6
Country Domains Servers Domains Servers
Czechia 1 217 718 3 354 1 074 303 1 091
United States 476 280 4 487 171 175 3 337
other 313 843 8 720 198 542 5 059
Sweden 224 844 159 223 695 87
Italy 221 957 244 218 812 42
United Kingdom 153 642 382 121 228 127
Germany 139 316 2 515 70 404 1 042
Slovakia 135 020 336 204 630 60

SLD networks

Location of authoritative DNS servers for second-level domains under .cz – autonomous systems (as of April 17, 2025)

IPv4
IPv6
AS Providers Domains Servers Domains Servers
AS16509 AMAZON-02 289 468 2 313 5 096 2 078
AS208414 WEDOS Internet 260 994 8 260 990 7
AS24806 INTERNET CZ 224 942 129 220 734 31
AS25234 ACTIVE 24 186 523 6 186 527 7
AS29134 Webglobe 138 265 32 137 471 13
AS31034 Aruba 221 444 37 218 674 10
AS48689 Webglobe 127 860 10 127 171 2
other other 1 453 385 17 662 1 066 468 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].