citrix.com - dns.ninja

citrix.com

DNSSEC⚠️ Not signed
A2001:4868:10c:3::15🇺🇸 AS7012001:4868::/32 MCI Communications Services, LLC d/b/a Verizon Business
A54.86.126.30🇺🇸 Amazon54.86.0.0/16 EC2 IAD prefix
NSnick.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3bd5🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnick.ns.cloudflare.com
A2803:f800:50::6ca2:c1d5🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRnick.ns.cloudflare.com
A2a06:98c1:50::ac40:21d5🇺🇸 Cloudflare2a06:98c1:50::/45
PTRnick.ns.cloudflare.com
A108.162.193.213🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnick.ns.cloudflare.com
A172.64.33.213🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnick.ns.cloudflare.com
A173.245.59.213🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnick.ns.cloudflare.com
NSnucum.ns.cloudflare.com
A2606:4700:50::a29f:2691🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnucum.ns.cloudflare.com
A2803:f800:50::6ca2:c291🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRnucum.ns.cloudflare.com
A2a06:98c1:50::ac40:2291🇺🇸 Cloudflare2a06:98c1:50::/45
PTRnucum.ns.cloudflare.com
A108.162.194.145🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnucum.ns.cloudflare.com
A162.159.38.145Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnucum.ns.cloudflare.com
A172.64.34.145🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRnucum.ns.cloudflare.com
MXcitrix-com.mail.protection.outlook.com ⭐
A2a01:111:f403:c902::16🇺🇸 Microsoft2a01:111:f000::/36
PTRmail-byapr04cu00306.inbound.protection.outlook.com
A2a01:111:f403:c92c::4🇺🇸 Microsoft2a01:111:f000::/36
PTRmail-dm6pr05cu00404.inbound.protection.outlook.com
A2a01:111:f403:f802::1🇺🇸 Microsoft2a01:111:f000::/36
PTRmail-sj2pr05cu00101.inbound.protection.outlook.com
A2a01:111:f403:f907::1🇺🇸 Microsoft2a01:111:f000::/36
PTRmail-dm1pr04cu00201.inbound.protection.outlook.com
A52.101.8.44🇺🇸 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-dm5pr04cu00104.inbound.protection.outlook.com
A52.101.10.8🇺🇸 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-bn1pr04cu00100.inbound.protection.outlook.com
A52.101.194.0🇺🇸 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-ch5pr02cu00200.inbound.protection.outlook.com
A52.101.194.4🇺🇸 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-ch4pr04cu00104.inbound.protection.outlook.com
TXT2t6gy0q499y96q28b0z5mnhtlks21rdd
TXT3t5bM076VhqoBQm0/iivRXpZWa6LpjLD8EFZCibjtEkr/dxH+cgwn0DQdbO20cYlWA36lpfLCHuWT...
TXT6e27d61c798a415a9254eedf47663922
TXTDynatrace-site-verification=32879264-2121-4161-a859-b13d10bb2502__duiqao3ktk2...
TXTDynatrace-site-verification=710e7769-2992-45d3-a823-7e0226503a22__12l0u0ber39...
TXTMS=36A460148583A60833119892ABAB4079FDF86E47
TXTMS=ms54920430
TXTMS=ms68893011
TXT_5vjloo5rruthg6a1s7a57tv0zc0c94g
TXT_7lgmmwvxfs1icnbx1juhqfzsv71v634
TXT_d6nbs1s3970i4oq5co9s131qoy6sb4k
TXT_en2ec2o9vhzzso2ye5qwfekjakak8f5
TXT_glr6aa90jm59t3ej0zsk6aso27xgrka
TXT_j1mb27jibc18zjp1p1vrhihsiwaoi5g
TXT_o3skw3we74rpkyulzn53mwku7o2w56n
TXT_thd3wsj9d2fqawbcdgzuuc7o7bi1h2i
TXTadobe-idp-site-verification=013ec935de02014472e246efd3805b6d350feb7a6f13449b6...
TXTadobe-idp-site-verification=b88397f8e98f219f8160f9bdb854fa0695a0c3efab9c22925...
TXTamazonses:E7SQiLGGpJUHZpsneQqzDqmNKue1IEVZdb1rENEi/Dg=
TXTapple-domain-verification=ET6dk0ADDepEVntW
TXTatlassian-domain-verification=ShopL09th5Q/UhA16zCVT436T8sB4PJ/vvlRxTvwfwYrGAU...
TXTatlassian-domain-verification=k6qJjBktGNUCqv7cL24iXYl3PRAIKerh6bZc8aqVCbAk2eb...
TXTatlassian-domain-verification=pM2zMVF3ilinGRzSJaFrifVDwKNfCc8YKepaMnFRG2pL7hZ...
TXTatlassian-sending-domain-verification=8e4f414f-ebd4-4bb2-8579-7c28a5ae7a66
TXTcanva-site-verification=mBJwllbVUompoPhUPgRwwg
TXTdocker-verification=c8b61426-355f-406c-848d-a9d0185d3948
TXTdrift-domain-verification=5edf4923a7503b0a6fac7ebf6bc74428e5188c6ac6005dcaaab...
TXTdrift-domain-verification=c286c113164c090e2f69012c3e8010164da9e5978fa3a34a5f0...
TXTdtm-domain-verification=UphS5F_eOHcz2Vh0XMWL2vwxZQ_wJZV90sGqbxWX9Ms
TXTfastly-domain-delegation-fddelt741634-2-21-24
TXTgoogle-site-verification=3ecYNAuVuxsdnmhq3Ad62yUTjNyu_zVw2Nis0h2qyzI
TXTgoogle-site-verification=ETMql6HI7j-2wO1XJTazSA4dUcdaAW-Sj_o-bKOp-dQ
TXTgoogle-site-verification=XIIa__E6cYK3Xakkc5hsDrkK5N5mEUUnJx65DOC_7i0
TXTgoogle-site-verification=bSH0MyYgC2I8yW9EHos2RQz-prfZMhWCRowUKu3pgCM
TXTgoogle-site-verification=c7rEgrYXVnflD00b7SleDHUN2kjZtD-OlQ4DIIvJdwg
TXTgoogle-site-verification=cGG0r71gpLRXk62j29Uiv86YPEKnvVKk8qlHYkRDt-8
TXTgoogle-site-verification=dDdG0qHwFD3ttQ-m4JRgcRHIHi5TXeyZWSABt9-_y-I
TXTgoogle-site-verification=jXyXsHF5vk-RhTtsKHf2YiDoNTVmQhneJbrTsfJSBcA
TXTgoogle-site-verification=lEvhlUkj6N0fViKKFL3vVrn32UD5QgF6K_ra8o2GfmY
TXTgoogle-site-verification=qbd0uPFSUTQ3x_NNe-XCYTEdJcTB6deO3en9M7aLHdY
TXTgoogle-site-verification=s3thrxQvgyMbkT53Ccnx8Jkfp8spWJoF9nQ2TfZuLSQ
TXTintersight=fbbc4e248c148b5d80a326da53022fdfcded163999ceaec6165a3973462a8afb
TXTlogmein-verification-code=34ca51fb-c701-459e-b60c-d266aa0b06ef
TXTlogmein-verification-code=c0b03e33-2d52-49d5-aef5-3a76dc891290
TXTlucid-verification=qe15rgfgj93635Klpky491
TXTmiro-verification=b7c7869613661d321b9662b83c6463432f5e9c40
TXTmongodb-site-verification=SamQU8vXenVX25pDkz4E8A71b38JNKqg
TXTmongodb-site-verification=asLRxyuY2hcOZHP9AEfjFett97gNq0TW
TXTmongodb-site-verification=jBiX7xzjOVLN7kwQfpqZ8kfQjB3MxXFt
TXTmpsfzpwyj351cdlsfxq70rqlc1b3881b
TXTonetrust-domain-verification=26961e9a8c964a7e8ac78900461bc12c
TXTpendo-domain-verification=L7LPRpdYTpJ-7Y93beMLtCEBSMU
TXTpexip-ms-tenant-domain-verification=e80b8b84-73b5-4b34-9123-c60ecb37a68a
TXTt2jcU7Uk003UBKV3zfl0
TXTv=spf1 include:spf.citrix.com include:spf2.citrix.com include:_spf.google.com...
TXTwiz-domain-verification=7c47753d31ab194423d6ca83573012e4140e16cd5539e71a3fa46...
TXTwiz-domain-verification=d55dbde953809d76190b0f95725a827016da98ac16de42ab1724f...
TXTwrike-verification=NDYxMTI0MTo0YWM2ZDkyMjhiNzFjYjVkYTJkNWUyOWZlOGZmNTZmZDFlNz...
TXTwrike-verification=NTAxMzcxNDpjMjRkNzkxNzZkNjFhNzVmZDBlNjczZDhkYTc4MDhjNmM0Y2...
TXTxdzkgym5phfnptplvzjm88vym4mhvpp3
SOAnick.ns.cloudflare.comdns@cloudflare.com serial=2409669514

com

DNSSEC🔒 Signed (DS record present)
NSa.gtld-servers.net ⭐
NSb.gtld-servers.net
NSc.gtld-servers.net
NSd.gtld-servers.net
NSe.gtld-servers.net
NSf.gtld-servers.net
NSg.gtld-servers.net
NSh.gtld-servers.net
NSi.gtld-servers.net
NSj.gtld-servers.net
NSk.gtld-servers.net
NSl.gtld-servers.net
NSm.gtld-servers.net
SOAa.gtld-servers.netnstld@verisign-grs.com serial=1784510952
rank #1367 globally
rank #732 in the tld
WOT: SAFE (93/100)
📈 Tranco rank: #2,923

PTR for

13.87.200.66.in-addr.arpa

Subdomains

chatproxy.citrix.com
support.citrix.com
ping.citrix.com
ftlmail.citrix.com
titan.citrix.com
ftpqa.citrix.com
nextstorecloud.citrix.com
identity.citrix.com
site.citrix.com
xs.citrix.com
prod-receiverupdatecheckruc.citrix.com
developer.citrix.com
recommendation.citrix.com
rttf.citrix.com
ediqa.citrix.com
deliver.citrix.com
qa-receiverupdatecheckruc.citrix.com
eu.citrix.com
tr.citrix.com
worxforms.citrix.com
devmy.citrix.com
receiverupdatecheckruc.citrix.com
prod-receiverupdatechecksec.citrix.com
sharefile.citrix.com
iforum.citrix.com
training.citrix.com
citrixready.citrix.com
qaentityservices.citrix.com
se.citrix.com
docs.citrix.com
phoenix.citrix.com
customerexperience.citrix.com
legacy.citrix.com
secureservices.citrix.com
ftlgslb.citrix.com
callhome.citrix.com
dta.citrix.com
download.citrix.com
manage-disc.citrix.com
drextdns01.citrix.com
sandbox.citrix.com
devinfo.citrix.com
pacdesktop.citrix.com
app.citrix.com
qa-receiverupdatechecksec.citrix.com
tarpon.citrix.com
fps-mw.citrix.com
cdn-web.citrix.com
assets.citrix.com
cis-staging.citrix.com
engxdus.citrix.com
ctxsym.citrix.com
casnb-aps-0-staging.citrix.com
ctxuk.citrix.com
accelerator.citrix.com
cloudops.citrix.com
citrixservicesdev.citrix.com
support-staff.citrix.com
testftp.citrix.com
demo.citrix.com
qautilityservices.citrix.com
qaftlagee.citrix.com
ftpsupport.citrix.com
canada.citrix.com
hqcon01.citrix.com
amsagee1.citrix.com
manage-monlb.citrix.com
sippilot.citrix.com
projects.citrix.com
taas.citrix.com
qaftlgo.citrix.com
lynx.citrix.com
info.citrix.com
as2qa.citrix.com
employeeconnect.citrix.com
accounts.citrix.com
no.citrix.com
dtaccelerator.citrix.com
notifications.citrix.com
as2dev.citrix.com
deventityservices.citrix.com
devutilityservices.citrix.com
community.citrix.com
vid.citrix.com
aws-us-e-device-posture-service.citrix.com
ealerts.citrix.com
worxnotes.citrix.com
gateway.citrix.com
goreceiver.citrix.com
reviews.citrix.com
ftlagee1.citrix.com
citrixservicesha.citrix.com
rtstxa.citrix.com
discussions.citrix.com
solutionssummit.citrix.com
blogs.citrix.com
citrixsummit.citrix.com
ctxdns06.citrix.com
downloads.citrix.com
sipt.citrix.com

Same first word

citrix.ir
citrix.com.tr
citrix.by
citrix.co.jp
citrix.cloud
citrix.space
citrix.org
citrix.net.pl
citrix.cc
citrix.com.br
citrix.ca
citrix.co.cr
citrix.network
citrix.careers
citrix.design
citrix.systems
citrix.co.uk
citrix.pro
citrix.lv
citrix.it
citrix.hk
citrix.support
citrix.jp
citrix.co.za
citrix.com.cn
citrix.cz
citrix.sk
citrix.com
citrix.education
citrix.uk
citrix.fi
citrix.me
citrix.company
citrix.co.in
citrix.com.pl
citrix.academy
citrix.co.kr
citrix.one
citrix.engineering
citrix.info
citrix.no
citrix.com.tw
citrix.com.ua
citrix.site
citrix.us
citrix.in
citrix.ro
citrix.com.ar
citrix.workers.dev
citrix.ru
citrix.online
citrix.training
citrix.org.cn
citrix.se
citrix.is
citrix.be
citrix.enterprises
citrix.expert
citrix.world
citrix.com.mx
citrix.lt
citrix.co.ve
citrix.com.au
citrix.rs
citrix.tv
citrix.cn
citrix.ch
citrix.mobi
citrix.dk
citrix.partners
citrix.lu
citrix.mx
citrix.technology
citrix.co
citrix.com.sg
citrix.net
citrix.eu
citrix.guru
citrix.de
citrix.kr
citrix.name
citrix.fr
citrix.biz
citrix.io
citrix.es
citrix.tech
citrix.tel
citrix.com.do
citrix.com.pe
citrix.net.my
citrix.ie

Similar names

crixit.com
critix.org
ctirix.com
xitric.com
xritic.com
critix.co.uk
xircit.com
trixic.com
xirtic.net
critix.com
critix.net
critix.ro
critix.fr
cirtix.de
xritic.org
cirtix.com
critix.de
xirtic.com

DNS History

23 records (5 active, 18 former)

20162017201820192020202120222023202420252026NSnick.ns.cloudflare.comnucum.ns.cloudflare.comctxdns01.citrix.comctxdns02.citrix.comctxdns05.citrix.comctxdns06.citrix.comns1.cedexis.netns2.cedexis.netns3.cedexis.netns4.cedexis.netMXcitrix-com.mail.protection.outlook.commx1.hc3370-68.iphmx.commx2.hc3370-68.iphmx.comsmtp.citrix.comsmtp.citrix.com.ausmtp.eu.citrix.comsmtp02.citrix.comsmtp03.citrix.comsmtpdr.citrix.comA2001:4868:10c:3::1554.86.126.30162.221.156.15666.165.176.15
○NSctxdns01.citrix.com2015-09-02 → 2019-06-21 · 4 obs
● 2015-09-02 19:00:16
● 2019-06-21 15:10:10
○ 2019-09-11 15:27:20
○ 2026-07-20 01:37:00
○NSctxdns02.citrix.com2015-09-02 → 2019-06-21 · 8 obs
● 2015-09-02 19:00:16
● 2016-08-03 09:55:44
○ 2016-08-11 20:08:54
○ 2016-09-14 00:09:52
● 2016-09-22 08:54:22
● 2019-06-21 15:10:10
○ 2019-09-11 15:27:20
○ 2026-07-20 01:37:00
○NSctxdns05.citrix.com2015-09-02 → 2019-06-21 · 4 obs
● 2015-09-02 19:00:16
● 2019-06-21 15:10:10
○ 2019-09-11 15:27:20
○ 2026-07-20 01:37:00
○NSctxdns06.citrix.com2015-09-02 → 2019-06-21 · 4 obs
● 2015-09-02 19:00:16
● 2019-06-21 15:10:10
○ 2019-09-11 15:27:20
○ 2026-07-20 01:37:00
●NSnick.ns.cloudflare.com2026-02-15 → 2026-07-20 · 3 obs
○ 2021-09-21 14:16:10
● 2026-02-15 06:50:46
● 2026-07-20 01:37:00
○NSns1.cedexis.net2019-09-11 → 2021-09-21 · 5 obs
○ 2019-06-21 15:10:10
● 2019-09-11 15:27:20
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
○NSns2.cedexis.net2019-09-11 → 2021-09-21 · 5 obs
○ 2019-06-21 15:10:10
● 2019-09-11 15:27:20
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
○NSns3.cedexis.net2019-09-11 → 2021-09-21 · 5 obs
○ 2019-06-21 15:10:10
● 2019-09-11 15:27:20
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
○NSns4.cedexis.net2019-09-11 → 2021-09-21 · 5 obs
○ 2019-06-21 15:10:10
● 2019-09-11 15:27:20
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
●NSnucum.ns.cloudflare.com2026-02-15 → 2026-07-20 · 3 obs
○ 2021-09-21 14:16:10
● 2026-02-15 06:50:46
● 2026-07-20 01:37:00
●MXcitrix-com.mail.protection.outlook.com2026-02-15 → 2026-07-20 · 3 obs
○ 2021-09-21 14:16:10
● 2026-02-15 06:50:46
● 2026-07-20 01:37:00
○MXmx1.hc3370-68.iphmx.com2019-05-17 → 2021-09-21 · 5 obs
○ 2019-03-11 18:37:20
● 2019-05-17 21:13:52
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
○MXmx2.hc3370-68.iphmx.com2019-05-17 → 2021-09-21 · 5 obs
○ 2019-03-11 18:37:20
● 2019-05-17 21:13:52
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
○MXsmtp.citrix.com2015-09-02 → 2019-03-11 · 4 obs
● 2015-09-02 19:00:16
● 2019-03-11 18:37:20
○ 2019-05-17 21:13:52
○ 2026-07-20 01:37:00
○MXsmtp.citrix.com.au2015-09-02 → 2019-03-11 · 4 obs
● 2015-09-02 19:00:16
● 2019-03-11 18:37:20
○ 2019-05-17 21:13:52
○ 2026-07-20 01:37:00
○MXsmtp.eu.citrix.com2015-09-02 → 2019-03-11 · 4 obs
● 2015-09-02 19:00:16
● 2019-03-11 18:37:20
○ 2019-05-17 21:13:52
○ 2026-07-20 01:37:00
○MXsmtp02.citrix.com2015-09-02 → 2019-03-11 · 7 obs
● 2015-09-02 19:00:16
● 2018-01-02 12:11:04
○ 2018-01-17 11:51:40
● 2018-03-26 21:12:32
● 2019-03-11 18:37:20
○ 2019-05-17 21:13:52
○ 2026-07-20 01:37:00
○MXsmtp03.citrix.com2016-09-06 → 2019-03-11 · 5 obs
○ 2016-03-04 01:31:58
● 2016-09-06 08:04:22
● 2019-03-11 18:37:20
○ 2019-05-17 21:13:52
○ 2026-07-20 01:37:00
○MXsmtpdr.citrix.com2015-09-02 → 2016-02-17 · 4 obs
● 2015-09-02 19:00:16
● 2016-02-17 19:42:54
○ 2016-03-04 01:31:58
○ 2026-07-20 01:37:00
○A162.221.156.1562017-05-18 → 2021-09-21 · 5 obs
○ 2017-05-17 06:53:34
● 2017-05-18 13:46:32
● 2021-09-21 14:16:10
○ 2026-02-15 06:50:46
○ 2026-07-20 01:37:00
●A2001:4868:10c:3::152015-09-02 → 2026-07-20 · 2 obs
● 2015-09-02 19:00:16
● 2026-07-20 01:37:00
●A54.86.126.302026-02-15 → 2026-07-20 · 3 obs
○ 2021-09-21 14:16:10
● 2026-02-15 06:50:46
● 2026-07-20 01:37:00
○A66.165.176.152015-09-02 → 2017-05-17 · 4 obs
● 2015-09-02 19:00:16
● 2017-05-17 06:53:34
○ 2017-05-18 13:46:32
○ 2026-07-20 01:37:00

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...-
citrix.comnick.ns.cloudflare.com, nucum.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.193.213

NS records: nick.ns.cloudflare.com, nucum.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for citrix.com (unsigned zone)

⏱️ Timing

Total: 417ms | Queries: -

📄 Records

TypeCountSample Data
A154.86.126.30
AAAA12001:4868:10c:3::15
NS2nick.ns.cloudflare.com, nucum.ns.cloudflare.com
MX1citrix-com.mail.protection.outlook.com (
TXT602t6gy0q499y96q28b0z5mnhtlks21rdd, 3t5bM076VhqoBQm0/iivRXpZWa6LpjLD8EFZCibj...
SOA1nick.ns.cloudflare.com dns.cloudflare.co

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (nick.ns.cloudflare.com, nick.ns.cloudflare.com, nick.ns.cloudflare.com...)

Related

⚔️ Similar Servicesf5.com

Analysis

Hierarchy

The domain citrix.com is parent to chatproxy.citrix.com, support.citrix.com, ping.citrix.com, ftlmail.citrix.com, titan.citrix.com and hundreds of other host names.

IP Addresses

citrix.com directs to two IP numbers, 54.86.126.30 and 2001:4868:10c:3::15

Two other host names, along with devicetrust.de, citrix.de and devicetrust.co, also share IP numbers with citrix.com.

Name Servers

DNS delegation for citrix.com points to two name servers: nick.ns.cloudflare.com and nucum.ns.cloudflare.com.

citrix.com shares its NS records with other domains, for example xaeaad.com, lux-aeterna-hamburg.de, unicon.com and two others.

citrix.com partially shares its NS delegation with several other domains, including wesellhost.com, bluepoppys.com, epicpopcorn.com and two others.

DNS names with 6 IP addresses:

nick.ns.cloudflare.com has IP addresses 108.162.193.213, 172.64.33.213 and 173.245.59.213, plus 3 other.

nucum.ns.cloudflare.com has IP addresses 108.162.194.145, 162.159.38.145 and 172.64.34.145, plus 3 other.

Mail Servers

The sole mail server for citrix.com is citrix-com.mail.protection.outlook.com.

With 8 IP addresses total, citrix-com.mail.protection.outlook.com resolves to 52.101.8.44, 52.101.10.8, 52.101.194.0 and 5 others.