isc.sans.edu - robtex.com

isc.sans.edu

DNSSEC⚠️ Not signed
A2606:4700:10::6814:22c9🇺🇸 Cloudflare2606:4700:10::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:10::ac42:976b🇺🇸 Cloudflare2606:4700:10::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.20.34.201Cloudflare104.20.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.66.151.107🇺🇸 Cloudflare172.66.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
MXmail-1a.dshield.org ⭐
A66.35.60.131🇺🇸 AS6266966.35.60.0/24 Iron Mountain Data Center
PTRmail-1a.dshield.org
MXmail-1b.dshield.org(20)
A66.35.60.132🇺🇸 AS6266966.35.60.0/24 Iron Mountain Data Center
PTRmail-1b.dshield.org
TXTv=spf1 include:isc.sans.edu._nspf.vali.email include:%{i}._ip.%{h}._ehlo.%{d}...
HTTPSHTTP/2 ✓ hints match
IPv4 hints104.20.34.201, 172.66.151.107
IPv6 hints2606:4700:10::6814:22c9, 2606:4700:10::ac42:976b

sans.edu

DNSSEC⚠️ Not signed
A45.60.31.34🇺🇸 IMPERVA45.60.31.0/24 Imperva inc
A45.60.103.34🇺🇸 IMPERVA45.60.103.0/24 ORIXCOM via EMIX
NSviolet.ns.cloudflare.com ⭐
NSyahir.ns.cloudflare.com
MXmxa-002c1802.gslb.pphosted.com ⭐
MXmxb-002c1802.gslb.pphosted.com ⭐
TXT82c4sg3vsw4s7kptpvzn6806kjjp3wlr
TXTJI6UZuSsLXHEjD7PIBR1rWcPOqRkKRV2VwWAdhXZnLfbjhmfHHOwjMPizS78hfcgbTtjG1TaPTcdV...
TXTMS=ms72131568
TXTcanva-site-verification=yj_t2AOb7g6O61LEAYaAzw
TXTglobalsign-domain-verification=4C67BEFB31EB3963BE86CC2DB3922A4C
TXTgoogle-site-verification=dUSOX9p4qG75qf-UfMNmy2Z_aIw_mK-4I5FiWl5Q4co
TXTopenai-domain-verification=dv-ud7uHGncEHoxqrKglDjUjQwT
TXTv=spf1 include:sans.edu._nspf.vali.email include:%{i}._ip.%{h}._ehlo.%{d}._sp...
TXTzapier-domain-verification-challenge=72b6728e-92b4-42ea-ab31-f8dd5d349ae6
SOAviolet.ns.cloudflare.comdns@cloudflare.com serial=2409937154
WOT: SAFE (93/100)
rank #11493 globally
rank #340 in the tld
WOT: SAFE (90/100)
📈 Tranco rank: #25,918

Same first word

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DNS History

15 records (6 active, 9 former)

20162017201820192020202120222023202420252026MXmail-1a.dshield.orgmail-1b.dshield.orgsmtp21a.sans.orgsmtp21b.sans.orgsmtp31a.sans.orgsmtp31b.sans.orgA104.20.34.201172.66.151.1072606:4700:10::6814:22c92606:4700:10::ac42:976b204.51.94.1532607:f1c0:846:9100::15c45.60.103.3445.60.31.3466.35.59.249
●MXmail-1a.dshield.org2026-02-17 → 2026-08-09 · 3 obs
○ 2021-05-12 04:47:54
● 2026-02-17 01:25:30
● 2026-08-09 21:59:02
●MXmail-1b.dshield.org2026-02-17 → 2026-08-09 · 3 obs
○ 2021-05-12 04:47:54
● 2026-02-17 01:25:30
● 2026-08-09 21:59:02
○MXsmtp21a.sans.org2015-09-03 → 2021-05-12 · 4 obs
● 2015-09-03 15:31:54
● 2021-05-12 04:47:54
○ 2026-02-17 01:25:30
○ 2026-08-09 21:59:02
○MXsmtp21b.sans.org2015-09-03 → 2021-05-12 · 4 obs
● 2015-09-03 15:31:54
● 2021-05-12 04:47:54
○ 2026-02-17 01:25:30
○ 2026-08-09 21:59:02
○MXsmtp31a.sans.org2015-09-03 → 2021-05-12 · 4 obs
● 2015-09-03 15:31:54
● 2021-05-12 04:47:54
○ 2026-02-17 01:25:30
○ 2026-08-09 21:59:02
○MXsmtp31b.sans.org2015-09-03 → 2021-05-12 · 4 obs
● 2015-09-03 15:31:54
● 2021-05-12 04:47:54
○ 2026-02-17 01:25:30
○ 2026-08-09 21:59:02
●A104.20.34.2012026-02-17 → 2026-08-09 · 3 obs
○ 2021-05-12 04:47:54
● 2026-02-17 01:25:30
● 2026-08-09 21:59:02
●A172.66.151.1072026-02-17 → 2026-08-09 · 3 obs
○ 2021-05-12 04:47:54
● 2026-02-17 01:25:30
● 2026-08-09 21:59:02
○A204.51.94.1532017-04-28 → 2019-12-26 · 9 obs
○ 2017-01-02 16:07:18
● 2017-04-28 17:31:06
● 2017-08-20 05:10:56
○ 2018-02-26 17:17:34
○ 2018-04-16 18:57:06
● 2018-11-20 11:05:52
● 2019-12-26 01:52:38
○ 2020-02-20 10:57:36
○ 2026-08-09 21:59:02
●A2606:4700:10::6814:22c92026-02-17 → 2026-08-09 · 3 obs
○ 2021-05-12 04:47:54
● 2026-02-17 01:25:30
● 2026-08-09 21:59:02
●A2606:4700:10::ac42:976b2026-02-17 → 2026-08-09 · 3 obs
○ 2021-05-12 04:47:54
● 2026-02-17 01:25:30
● 2026-08-09 21:59:02
○A2607:f1c0:846:9100::15c2015-09-03 → 2017-08-20 · 4 obs
● 2015-09-03 15:31:54
● 2017-08-20 05:10:56
○ 2018-02-26 17:17:34
○ 2026-08-09 21:59:02
○A45.60.103.342020-02-20 → 2021-05-12 · 5 obs
○ 2019-12-26 01:52:38
● 2020-02-20 10:57:36
● 2021-05-12 04:47:54
○ 2026-02-17 01:25:30
○ 2026-08-09 21:59:02
○A45.60.31.342020-02-20 → 2021-05-12 · 5 obs
○ 2019-12-26 01:52:38
● 2020-02-20 10:57:36
● 2021-05-12 04:47:54
○ 2026-02-17 01:25:30
○ 2026-08-09 21:59:02
○A66.35.59.2492015-09-03 → 2018-04-16 · 8 obs
● 2015-09-03 15:31:54
● 2017-01-02 16:07:18
○ 2017-04-28 17:31:06
○ 2017-08-20 05:10:56
● 2018-02-26 17:17:34
● 2018-04-16 18:57:06
○ 2018-11-20 11:05:52
○ 2026-08-09 21:59:02

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
edua.edu-servers.net, b.edu-servers.net, c.edu-servers.net, d.edu-servers.net...-
sans.eduviolet.ns.cloudflare.com, yahir.ns.cloudflare.com-

✅ Authoritative Response

Server:173.245.58.237

NS records: violet.ns.cloudflare.com, yahir.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for sans.edu (unsigned zone)

⏱️ Timing

Total: 266ms | Queries: -

📄 Records

TypeCountSample Data
A2172.66.151.107, 104.20.34.201
AAAA22606:4700:10::ac42:976b, 2606:4700:10::6814:22c9
MX2mail-1a.dshield.org (pri: 10), mail-1b.dshield.org (pri: 20)
TXT1v=spf1 include:isc.sans.edu._nspf.vali.e
HTTPS1{"priority":1,"target":".","alpn":["h2"]

Analysis

IP Addresses

isc.sans.edu directs to four IP numbers, which are 104.20.34.201, 172.66.151.107, 2606:4700:10::6814:22c9 and 2606:4700:10::ac42:976b.

8.23.wcomp.quoka.de, diskussionen.quoka.de, avatar.quoka.de plus two other host names have IP numbers in common with isc.sans.edu.

Mail Servers

isc.sans.edu uses two mail servers, mail-1a.dshield.org and mail-1b.dshield.org.

isc.sans.edu, dshield.org and isc.sans.org all share the same mail server setup.

Each of mail-1a.dshield.org and mail-1b.dshield.org has one IP address: mail-1a.dshield.org uses 66.35.60.131 and mail-1b.dshield.org uses 66.35.60.132.