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Insights: the DNS in aggregate

Counts and shares over the names and records ndxer holds — what types exist, who answers for the most domains, where aliases point, what TXT is used for. Every figure below says when it was computed.

Figures marked ~ are close estimates rather than exact counts — about these numbers.

Aggregates only. No individual name is published on this page.

What TXT is used for

TXT records grouped by what they turned out to be. spf is a sender policy, dkim a mail signature, dmarc a mail policy, verification a proof of domain ownership, and other is everything else.

Share of TXT records by what the record is for.
Kind Records Domains
spf 157,177,474 38,205,916
verification 91,053,887 14,698,131
other 41,754,016 7,149,245
dmarc 949,736 241,744
dkim 794,904 172,369

5 rows

Proofs of ownership

The key at the front of a TXT proof-of-ownership record names the service that asked for it. These are the most asked for.

Domains carrying each proof-of-ownership key.
Key Domains
google-site-verification 10,499,088
ms 3,413,789
facebook-domain-verification 620,052
apple-domain-verification 381,746
zoho-verification 359,449
_globalsign-domain-verification 267,786
klaviyo-site-verification 201,763
nameshift 190,116
saw-market 179,767
atlassian-domain-verification 143,490
openai-domain-verification 139,903
mailerlite-domain-verification 117,378

12 rows

Who may issue certificates

A CAA record names the certificate authorities a domain allows to issue certificates for it. These are the authorities the most domains name.

Domains naming each certificate authority.
Certificate authority Domains
letsencrypt.org 1,777,337
sectigo.com 817,410
digicert.com 751,782
pki.goog 571,767
comodoca.com 350,854
ssl.com 274,290
globalsign.com 209,567
certum.pl 61,986
amazon.com 52,329
amazontrust.com 28,006
godaddy.com 24,220
amazonaws.com 21,503

12 rows

What DMARC records ask for

A DMARC record tells a receiving mail server what to do with mail that fails authentication: nothing (none), hold it aside (quarantine), or turn it away (reject). unspecified is a DMARC record this page could not read a policy out of.

Share of domains by what their DMARC record asks for.
Policy Records Domains
none 629,544 159,899
reject 149,707 40,805
quarantine 155,546 39,987
unspecified 10,954 2,014
policy 433 116
quarantine\\ 110 104
quarentine 349 91
quarantine\ 327 82
monitor 247 64
quarantaine 210 52
policy name 145 38
none\\ 33 32
ninguno 66 17
accept 69 17
non 65 17
reject\\ 16 16
politiknavn 55 14
none. 35 11
rejet 44 11
35 11
nessuno 40 10
none sp=none 32 9
keine 43 7
quarentena 27 7
policynamn 29 7
yok 25 7
quaratine 24 6
none pct=100 25 6
quarantine, rua=mailto:dmarc@artlogic.net 23 6
aucun 21 5
nonev=dmarc1 15 5
ignore 24 5
beleidsnaam 16 4
cuarentena 16 4
1quarantine 17 4
none rua=mailto:gusbravo@fundacionmona.org 17 4
rejeter 17 4
none, 16 4
none\010 4 4
none\" 3 3
none" 13 3
100 6 3
strict 13 3
nenhum 12 3
ingen 14 3
richtlinienname 13 3
none mail-tester.com 15 3
[none] 12 3
rejeitar 13 3
nonemail-tester.com 14 3
p=quarantine 13 3
quarantine. 11 3
one 13 3
none: 11 3
qurantine 8 2
kacper.witczak@vcn.pl 9 2
none rua=mailto:dmarc_agg@vali.email 9 2
quarintine 8 2
all 9 2
none adkim=r 8 2
reject/quarantine 5 2
allow 9 2
<policy> 8 2
quarantine rua=mailto:d40_alerts@hrc365.onmicrosoft.com ruf=mailto:d40_alerts@hrc365.onmicrosoft.com fo=1 8 2
quarantinet 9 2
nome 5 2
rechazar 8 2
none\ 8 2
reject, sp=reject 8 2
n 5 2
<none> 8 2
none +@+ 9 2
quarantäne 9 2
reject:pct=100 8 2
policy quarantine 8 2
karantina 8 2
reject adkim=s 8 2
quatantine 8 2
rejected 8 2
reject" 6 2
quarantine: pct=100 8 2
q 8 2
quarantime 8 2
r 5 2
ablehnen 9 2
rnone 8 2
none verification details: mail-tester.com 8 2
policynavn 20 2
quarantine\\\\ 2 2
quarantine pct=100 5 2
quarantine: ruf=mailto:storataptyltd1@au.cp-dmarc.com 4 1
quatrantine 4 1
miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqea5ncnkp9uyvqqso7fm6lnw34drybirvz39bqdsdl6bhnh/vym/hpv5qpoypkhb17ego5annbny7qltyhfkhvc2va7rv40dz6y2t3k328v4fjej3aw3mv0p5jwkxxelhyg6hvgqrhmgeyvaewg9fh2ji2hbmy3eegmgxecw2jmh07gzdiojth04z7y+ahreu9ybcc3fv/uy2qk/yvi/zymy76h5xipnocdwegxejjxbjhq22u2qeth4oyzguqikh8veyopmsya8ge0/hp6vkztbpeb1te0ox5q+crmv+8sfpn5efz77klikjo6cbg8qmgmzqpzvwwkwgzgvhte5t8htqidaqab 4 1
quarantinereplit-verify=2386defb-be66-4b12-83f3-b4d09b6b8180 5 1
=none 3 1
nenhuma 4 1
nonerua=mailto:dmarc-reports@sorujewellery.com 4 1
quarantine rua=mailto:leisa@australiantoursandcruises.com.au 4 1
none rua=admin@redwoodcoastrivianclub.com 4 1
rejec 1 1
deny 4 1
none rua=mailto:rua@dmarc.brevo.com 4 1
quarantine rua=mailto:postmaster@lookandcook.com 3 1
quarantine ttl: automatic 4 1
none\010ttl: default value 1 1
none include:_dmarc.alexanderhartmann.de 5 1
reject rua=mailto:abuse@accessiumgroup.com 5 1
quarantine, rua=mailto:dmarc@ekom21.de 4 1
none _dmarc.dtxpets.com 4 1
dmarc 4 1
monitor\\ 1 1
reject,pct=100, 4 1
none rua=mailto:mad@baglokalet.dk 5 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqde+rjf27i/zh5zss2dhjumnfv+wcjt/n1tzhg6qoijz4hlfp63rhved40oe8cxjbhtgkpyzeqledujl/lzqcndznzzldlibpbuhkhc1nugz8uebw21hz+6gj0zxrmlpbsqfmexfj dadge/ofqlycerxyw2ycugrcel+mo3gybccqidaqab 1 1
quarantine _dmarc.yourdomain.com 4 1
??? 1 1
noneqlew 5 1
afvis 4 1
none rua=mailto:dmarc@pipocafun.com 5 1
2 3 1
brak 4 1
none rua=mailto:karson@massivelyhuman.com 4 1
reject' rua=mailto:postmaster@arcisgolf.com 4 1
quarantine rua=mailto:dmarc@norsonic.fr 3 1
reject=mailto:c141d67fd7@rua.easydmarc.us,mailto:john.traeger@issaquahkiwanis.org 1 1
migfma0gcsqgsib3dyywbhbmltyxrpb24u ywrtaw4udmvyc2lvbjogcm9sdc5jb20 4 1
quarantine nimi 4 1
none ttl: default value 4 1
p=none 1 1
none verification details: 4 1
quarantine rua=mailto:dmarc.report@sainsburycentre.ac.uk 4 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqc0diuxloejjurru6v4xnau70jieefgnkiiu6pk3i+1pgkyoloyjfzk+ah8zroujjszv95nxtdyervpgxfgu+jxkv3zdjucmkd/sxkiq8pj0uk1mkkkufnygvoxw5umq8vnpstzzfjhcrcygb1iw+ofabbbfshim98yuan7q7kkcqidaqab 4 1
qv=dmarc1 3 1
quarantine:pct=100 4 1
none rua=mailto:kasey@elvisridgecapital.com 4 1
reject rua=mailto:rua@feuerwehr-huglfing.de 4 1
nothing 4 1
reject rua=mailto:domains@aps-hh.de 4 1
quarantine fo=1 4 1
none to domain_dmarc.infraport.world 4 1
none rua=mailto:info@3nmotion.org 4 1
p 5 1
miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqeagannawjdgoqarqrewbwfjjo0tdjejnwen8sh/tl9t8rwrup/yqulzqms5jre0u9bxtejn/ksl/rgjkyyuadxj0ts0p+dk4sbobirbaiu 1 1
none rua=mailto:info@wearelions.be 4 1
none spf1 ip4:176.123.4.218 +a +mx +ip4:104.149.221.234 +ip4:104.149.221.236 ~all 4 1
none rua=mailto:support@rueger-it.de 4 1
0 4 1
none,sp=none 4 1
owenarmour.com 4 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqcxfogrrpka7unkwrs1b6qt/8bdper0dtzompynwjrw7aunz1yxp48a1miklnzjjqta91zt0xkowlvwi4iwdms8yyannklgfmoz4kfndfosj4n57kccuagsaqsokg0mblhe88/ptrexqzls2vcckmtyxvnk0kz6548t2/12grvgdqidaqab 4 1
quara...m=r 4 1
none _dmarc 5 1
quarantine rua=info@silvanstrub.ch 4 1
none fo=1 3 1
pol?tica 4 1
policy quarantaine 4 1
none _dmarc.entrywayrealestate.com 4 1
dmarc policy 5 1
quarant\195\131\194\164ne 1 1
report 4 1
none include:_dmarc.stichtingsava.org 4 1
quarantines 4 1
none rua=mailto:valery.dubois@cfahcconseil.com 4 1
refect 4 1
reject:rua=mailto:nabeel@dreamsoft.ae 4 1
weigeren 4 1
_dmarc.aadhiondigital.com 4 1
none[ ] 1 1
none/ 1 1
miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqea0rfllylnifxjvhpiisuviora5+kdbswpoear0syxi1viafwbwtzwzw6f8b8kasolcrhaicucf2lsolrakcm8ew/zzhc1ng7k2zir6p0h6fd4g9im358rpj69d4xkxzsbfncobwdk/8ef4l7pfe+b9hpo50hzdg8sxn08jn767nmtm2bs5qzynzn92rsi5o5fxlzyum6qrsbs1yhtj7phpfnel0x3limps6qnu8ozq8pdps/j+zmelguqysw7bzo2eo3crz/mfjdozy0v043llzm9loaqabdp80yuyymtfz2pjhuasoesn1ei589j9mg1gbtuafv1u+vvg2emjx8dewidaqab 3 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqdfb2wea1iowz7ewscz7s+zssrg5u+bco05ayyxpzkuxgrunoqcmfdkdffgqagpeeeuxc0u4qed7rub8l3intmrqwahv4ic2bbnc975yza1rpfo9bhhljygd0tqdpi1rslthufspc0yc3xp9vew2xi1ivl/qzg0uvozhkqaf4zcawidaqab 1 1
quarrantine 5 1
noneklaviyo-site-verification=tbeqbx 4 1
reject rua=mailto:info@kitroulette.com .onmicrosoft.com 6 1
none (guide) 4 1
done 3 1
quarantine=mailto:c141d67fd7@rua.easydmarc.us,mailto:john.traeger@issaquahkiwanis.org 1 1
quarantine rua=mailto:info@australiantoursandcruises.com.au 4 1
none,rua=mailto:info@heeboss.nl,ruf=mailto:info@heeboss.nl 4 1
quaranine 5 1
quarantine cancel 4 1
none 2 4 1
reject, pct=100 4 1
value none 4 1
klarhet.se 3 1
reject\" 1 1
wildax 4 1
quarantine rua=mailto:rua@dmarc.brevo.com 4 1
none rua=mailto:info@suneagle.store 4 1
none,rua=mailto:postmaster@hugsys.com 4 1
none under host _dmarc 4 1
none/reject/quarantine 5 1
value none 1 1
noneverification details: 4 1
none rua=mailto:yves@optigroup.be 4 1
quarantã¤ne 4 1
none _dmarc.werbemittel-das.de 4 1
none: rua=mailto:joey.wood@grtrubber.com 4 1
none,rua=mailto:mailauth-reports@gg.com 3 1
none rua=mailto:support@gzd.com.au 5 1
none rua=mailto:marc@derendinger.com 3 1
none rua=mailto:mkbdmarc.nl 4 1
restrict 4 1
reject rua=mailto:rua@utch.edu.co 5 1
5 4 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqdmi0hizoau/qgbf9gzql8au2sbbawd36vd8blzb0xx7/e72n77s2jmmizcp1xpo4 ro/kpwidkjwo6zaxtc06vbgkarketgcej4dqic/xinaob2pikq1q7x/xoak+skb9vfr+waj1ihwr7rds2siatff0fqtbp0xkfdv35se2ujqidaqabmiicxgibaakbgqdmi0hizoau/qgbf9gzql8au2sbbawd36vd8blzb0xx7/e72n77 1 1
none: rua=mailto:dmarc@shedi.com.br 4 1
quarantine v=spf1 include:spf.protection.outlook.com a:dispatch-us.ppe-hosted.com +a +mx +a 4 1
quarantine pct=10 3 1
pouyadadeh.com 5 1
quarantine rua=mailto:dominic@australiantoursandcruises.com.au 4 1
quarantine protonmail-verification=17d2451bc6c43e8a8bef2a0410d95bca62377413 4 1
*@nurucoffee.com 4 1
none verification details: mail-tester.com 5 1
noreply@netadmins.ca 4 1
quaarantine 4 1
nonv=dmarc1 4 1
none: rua=mailto:ciso@gsfc.org 1 1
none\009v=spf1 mx a ip4:85.95.249.64 ip4:85.95.248.17 -all 1 1
quarantine rua=mailto:info@buffetheroes.com 3 1
none:rua=mailto:dmarcreports@adaptivetraining.dog 4 1
none | ttl: automatic 3 1
none: ruf=mailto:storataptyltd1@au.cp-dmarc.com 1 1
quarantine rua=mailto:dmarc-reports@mwengineers.com 4 1
none rua=mailto:dmarcreports@slatbox.com.au 4 1
quarantine p=miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqea1xz7n5dvt+a6porxmezmfb+3s3ftes0xwyymarqagdeym8worj1drkszr3xxrjfdbj3rhfap9mvyfpqkr1fip7hllt20bupfxsw/bb6gpgisqx0tw3z+ewq7evdy6+d4xloloe+9/wlykjgqkdm7mwfs+a8cwcqwstbiqd0pyty0ym5oiwlqx8/pytp7how/z 4 1
[quarantine] 4 1
none rua=mailto:website@strategicresearch.net 4 1
reject rua 4 1
none rua=administrator@kellwest.com 4 1
quarantine pct=25 4 1
none[] 4 1
none,_dmarc 4 1
nklaviyo-site-verification=xtrkueone 5 1
_dmarc.aaronscottrichards.co.uk 4 1
none rua=mailto:itadmin@informediate.com 5 1
quarantine, rua=mailto:info@wills-art.com 4 1
pass 4 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqc1lwodttuyuayqw11w31iinc8gexmoojcikw70tcjljce 6hwrporvwhpzup7zvbamcksh/wqsit0+ag181i7cmxcvvbqollfkuyxela9o1nkutwbrwdvtq4fcj13+itenv3ijyrv+vgrzhbjkgibtubmmu2d3clbfpq7sz+ndknqidaqab 1 1
quarantine v=spf1 include:spf.protection.outlook.de -all 4 1
quarant\195\164ne 1 1
'quarantine' 5 1
none,rua=mailto:info@coursewise100.nl,ruf=mailto:info@coursewise100.nl 4 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqcxra/bp1sevvlxlytznhogr0tblulktrcj/7+wd6or6axioabpmdqaxy3cpuxfui4g7xkcvv7uw9dmhg0q0diaetohkqx75dvcpzi0p5jt/4y3vrviuzrla8fqpw3pmpr8idyvfo3j3frjxpsdamlsbu68dke3copwf0egaaihgwidaqab 4 1
quarantine sp=quarantine adkim=r aspf=r 4 1
quarantine rua=mailto:info@jmrab.edu.lb 5 1
none july2023._domainkey 4 1
quarantine rua=mailto:sally@australiantoursandcruises.com.au 4 1
reject\010 1 1
stereoexchange.dk 5 1
none pada hostname _dmarc 4 1
none=mailto:info@buyinsicily.com ruf=mailto:info@buyinsicily.com 1 1
quarantine\009 1 1
quarantine[eur02.safelinks.protection.outlook.com] 2 1
none rua=mailto:12f53e4e701c469d95ca17c276962fa9@dmarc-reports.cloudflare.net 4 1
ninguna 4 1
none\009_dmarc 1 1
1 quarantine 5 1
lauralieff.com 4 1
quarantine ruf=mailto:dmarc-forensic@eurobest-holding.com 4 1
none:ruf=mail-reports@marmignonbrothers.com 4 1
quarantine, rua=mailto:tech+avery@frogdog.io 4 1
afvise 4 1
none, rua=mailto:rallison@powerdraulics.com 4 1
none@ina217.76.57.75 4 1
none rua=mailto:dmarc@makuagroup.com 5 1
quarantine**_ 4 1
miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqea0rfllylnifxjvhpiisuviora5+kdbswpoear0syxi1viafwbwtzwzw6f8b8kasolcrhaicucf2lsolrakcm8ew/zzhc1ng7k2zir6p0h6fd4g9im358rpj69d4xkxzsbfncobwdk/8ef4l7pfe+b9hpo50hzdg8sxn08jn767nmtm2bs5qzynzn92rsi5o5fxlzyum6 qrsbs1yhtj7phpfnel0x3limps6qnu8ozq8pdps/j+zmelguqysw7bzo2eo3crz/mfjdozy0v043llzm9loaqabdp80yuyymtfz2pjhuasoesn1ei589j9mg1gbtuafv1u+vvg2emjx8dewidaqab\010 1 1
none\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ 1 1
none rua=mailto:admin@maplebrookvt.com 3 1
quarentine: p=reject 1 1
martindance.com 4 1
none v=spf1 include:_spf.mlsend.com a mx ip4:185.225.161.45 ~all 4 1
none v=spf1 mx a ip4:85.95.249.64 ip4:85.95.248.17 -all 5 1
none. rua=mailto:report#campoo.camp 5 1
none\009 1 1
quarntine 5 1
quarantine pct=100 rua=mailto:postmaster@roserockcoffee.com 4 1
quarantine, pct=100, rua=mailto:admin@schreinerei-gebhardt.com 4 1
none, fo=1 5 1
none_dmarc 4 1
none9 1 1
mail to:admin@mlhpbc.com 5 1
none rua=mailto:dmarc@oijj.org, mailto:dmarc@oijj.org 4 1
quarantine: 5 1
none mail-tester.com 5 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqdgp1v4o4tyuxvspihqoipyfukjinqoqrng2xelrcfcesiulvtekmaw1cp4tnjiea43jplztobcqcqyya3yxqkcrtn8ysgrp+mwjzc 1vjdkppvromxqvm3ggze31lajvtdm8+tnapstfk5onbvrn2ed+ms2hhqkzuf0zlzjufr8yqidaqab 1 1
reject=1 3 1
value 5 1
none rua=mailto:vinay.uchil@eoseng.com 4 1
sightlineprovisions.com 4 1
quarantine\" 1 1
miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqeamguuwi4ucy+ywmvyoypearpqjsicubw9qicdxxie9wajztigttfy7r8le7j1jmx7xbugj0rjhmrxhvvi+r6gucoksj08k6ta+rxfwow+7vjvzpfws5ugi105xtk3cqaek6jbihftk 7owdujutoqmgx25wykqtem4n1jis7l9kvcczyuz8neqzjpiinddhhslr\" \"ytqua1h07sngkaxebyip0wzabtm8asbhbvib3atndnlb/afagojvizr4cro7l0smfw3datfdlbolzrhwvmdwb3mx9kcb8endnyevhhhkrfhhuv1wsp4vrldkaojfgy6q+rbehtxoz3w3pacnfhtcwidaqab\\ 1 1
quarantine adkim=r 4 1
perfect 5 1
none: pct=100 4 1
pending 5 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqdcsdvfpeldbpkrmy7rm7hbij9h1dp+mzu5ztlbyzlziysckagbnir/e9zgs+owvimvyfcru/f0yqhdmycf/grtmcollkb02/63orifhumlqq2porxwenmcfgiat1cjtnskqlmrhxju/bqh/xn1xadinw5anq ktlxmgryyyc/rvdqidaqab 1 1
p=reject 4 1
quarantne 2 1
rasp.org.al. 5 1
fail 4 1
reject verification details: mail-tester.com 5 1
none value 4 1
yerewinedays 4 1
uarantine 3 1
reject rua=mailto:igor.komir@telavai.net 5 1
quarantine nicmail20230706._domainkey 4 1
none rua=mailto:cnie-rcie@cnie-rcie.ca 4 1
reject rua=mailto:dmarc@yeldadogan.com 3 1
hansmeex.nl 4 1
miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqea5ncnkp9uyvqqso7fm6lnw34drybirvz39bqdsdl6bhnh/vym/hpv5qpoypkhb17ego5annbny7qltyhfkhvc2va7rv40dz6y2t3k328v4fjej3aw3mv0p5jwkxxelhyg6hvgqrhmgeyvaewg9fh2ji2hbmy3eegmgxecw2jmh07gzdiojth04z7y+ahreu9yb cc3fv/uy2qk/yvi/zymy76h5xipnocdwegxejjxbjhq22u2qeth4oyzguqikh8veyopmsya8ge0/hp6vkztbpeb1te0ox5q+crmv+8sfpn5efz77klikjo6cbg8qmgmzqpzvwwkwgzgvhte5t8htqidaqab 1 1
none host name: _dmarc.domain name 5 1
quarantine rua=mailto:dmarc-daniel@tankstreamlabs.com 4 1
none los detalles de verificaci\195\131\194\131\195\130\194\179n: mail-tester.com 1 1
e 4 1
none: rua=mailto:dmarc-robin@meihauslaw v+spg1 include:secureserver.net -all 4 1
reject,automatic 2 1
none v=dmarc1 2 1
migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqdaiya3yjpjow30ttt2gckfevcpkjedn1ochrnisoi8a/2g9vjdikdvpzgqopcsrwwqrv9uwok5junindbtrze9oa9ptciswbvemzmfszcmygicsz5qkurajw87dwlfkghphj jmwtdx24m+ixwewa0asf++pmvh0armvge8od3mkwidaqab 1 1
validate 4 1
policy marina 3 1
[policy] 4 1
none +all 4 1
none los detalles de verificaciãƒâ³n: mail-tester.com 4 1
quarantin 4 1
quarantine pct=100 rua=mailto:admin@ltof.org.uk 4 1
none/quarantine/reject 4 1
quarantine p=miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqea1xz7n5dvt+a6porxmezmfb+3s3ftes0xwyymarqagdeym8worj1drkszr3xxrjfdbj3rhfap9mvyfpqkr1fip7hllt20bupfxsw/bb6gpgisqx0tw3z+ewq7evdy6+d4xloloe+9/wlykjgqkdm7mwfs+a8cwcqwstbiqd0pyty0ym5oiwlqx8/pyt p7how/z 1 1
none rua=mailto:tholguin55@cityofdilleytx.com 4 1
none rua=mailto:info@sateye.nl 4 1

331 rows

Over time

Each figure is stored every time it is calculated, so these lines follow the same numbers as the tables above.

Who may issue certificates

Who may issue certificates, across 240 stored calculations.

About these numbers