Row

Resolvers

Country analysis – daily QPS averages for queries originating from resolvers in a given country during the last 30 days before May 17, 2025

Country Max qps Min qps Trend Average
USA 7 172 6 242 6 655
other 4 236 3 667 3 909
Czechia 3 511 2 503 3 024
Germany 3 225 2 384 2 865
Netherlands 1 709 1 046 1 397
Sweden 1 210 737 1 124
France 1 045 757 907
Singapore 976 642 794
China 1 033 597 772
Ireland 997 439 721
UK 723 522 626
Brazil 535 384 454
India 548 328 417
Russia 485 311 399
Finland 604 258 358
Italy 351 233 291

Query type analysis – daily QPS averages for queries with a given QTYPE during the last 30 days before May 17, 2025

QTYPE Max qps Min qps Trend Average
A 14 343 12 057 13 375
NS 5 384 4 357 4 863
AAAA 3 007 2 487 2 734
DS 2 165 1 690 1 878
MX 833 431 631
other 534 402 469
TXT 367 195 280
SOA 209 92 143

Traffic flows – average distribution of QPS since 2025-05-10

Authoritative servers

Server analysis – daily QPS averages for queries reaching an authoritative server in a given city during the last 30 days before May 17, 2025

City Max QPS Min QPS Trend Average
Frankfurt am Main 6 000 4 635 5 386
Praha 5 046 3 359 4 262
Reston (VA) 2 786 2 159 2 536
London 2 612 2 133 2 415
Seattle (WA) 2 421 1 864 2 167
Singapore 2 487 1 887 2 078
Tokyo 1 509 915 1 122
Stockholm 1 153 761 1 045
São Paulo 847 680 736
Bratislava 671 508 579
Wien 572 426 494
undisclosed 555 385 487
Kyiv 553 353 453
Johannesburg 494 251 302
Santiago de Chile 331 68 258
Milano 267 0 199
Los Angeles (CA) 280 99 159
Sydney 108 82 92

Response code analysis – daily QPS averages for queries responded with a given RCODE during the last 30 days before May 17, 2025

RCODE Max QPS Min QPS Trend Average
NoError 23 613 18 989 21 477
NXDomain 3 534 2 989 3 227
Refused 53 2 15
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 May 8, 2025)

IPv4
IPv6
Country Domains Servers Domains Servers
Czechia 1 218 059 3 343 1 074 585 1 090
United States 475 015 4 480 171 065 3 333
other 309 589 8 708 196 420 5 063
Sweden 224 671 159 223 527 87
Italy 222 280 244 219 152 42
United Kingdom 153 966 374 121 127 127
Germany 140 418 2 507 70 504 1 043
Slovakia 134 921 337 202 375 60

SLD networks

Location of authoritative DNS servers for second-level domains under .cz – autonomous systems (as of May 8, 2025)

IPv4
IPv6
AS Providers Domains Servers Domains Servers
AS16509 AMAZON-02 289 281 2 317 5 122 2 079
AS208414 WEDOS Internet 260 959 8 260 955 7
AS24806 INTERNET CZ 225 264 130 221 068 31
AS25234 ACTIVE 24 186 584 6 186 588 7
AS29134 Webglobe 138 140 32 137 351 13
AS31034 Aruba 221 767 37 219 012 10
AS48689 Webglobe 127 791 10 127 107 2
other other 1 444 943 17 612 1 060 756 8 696

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].