tc.edu - robtex.com

tc.edu

DNSSEC⚠️ Not signed
A34.196.195.67🇺🇸 Amazon34.192.0.0/12 EC2 IAD prefix
PTRec2-34-196-195-67.compute-1.amazonaws.com
NSext-ns1.columbia.edu ⭐
A2001:18d8::35🇺🇸 COLUMBIA-GW2001:18d8::/32 CU-NET-2001-18D8
PTRext-ns1.columbia.edu
A2001:18d8:1::1:1🇺🇸 COLUMBIA-GW2001:18d8::/32 CU-NET-2001-18D8
PTRext-ns1.columbia.edu
A128.59.1.1🇺🇸 COLUMBIA-GW128.59.0.0/16 CU-NET-128-59-0-0
PTRext-ns1.columbia.edu
NSauth1.dns.cogentco.com
A2001:550:1:a::d🇺🇸 COGENT2001:550::/32 Cogent Communications
PTRauth1.dns.cogentco.com
A66.28.0.14🇺🇸 COGENT66.28.0.0/16 Cogent
PTRauth1.dns.cogentco.com
NSauth2.dns.cogentco.com
A2001:550:1:b::d🇺🇸 COGENT2001:550::/32 Cogent Communications
PTRauth2.dns.cogentco.com
A66.28.0.30🇺🇸 COGENT66.28.0.0/16 Cogent
PTRauth2.dns.cogentco.com
MXaspmx.l.google.com ⭐
A2607:f8b0:4004:c19::1b🇺🇸 Google2607:f8b0:4004::/48
PTRbk-in-f27.1e100.net
A172.253.62.27🇺🇸 Google172.253.62.0/24
PTRbc-in-f27.1e100.net
MXalt1.aspmx.l.google.com(50)
A2607:f8b0:4003:c30::1b🇺🇸 Google2607:f8b0:4003::/48
PTRyutulis-in-f27.1e100.net
A74.125.27.26🇺🇸 Google74.125.27.0/24
PTRyutulis-in-f26.1e100.net
MXalt2.aspmx.l.google.com(50)
A2607:f8b0:4001:c70::1a🇺🇸 Google2607:f8b0:4001::/48
PTRyucbful-in-f26.1e100.net
A192.178.209.26🇺🇸 Google192.178.209.0/24
PTRyucbful-in-f26.1e100.net
MXalt3.aspmx.l.google.com(100)
A2607:f8b0:4024:c0d::1b🇺🇸 Google2607:f8b0::/32
PTRmj-in-f27.1e100.net
A192.178.152.26🇺🇸 Google192.178.152.0/24
PTRmj-in-f26.1e100.net
MXalt4.aspmx.l.google.com(100)
A2607:f8b0:4023:403::1a🇺🇸 Google2607:f8b0::/32
PTRgg-in-f26.1e100.net
A142.250.96.27🇺🇸 Google142.250.96.0/24
PTRgg-in-f27.1e100.net
TXTapple-domain-verification=dyj1ynX4cKlenC4N
TXTamazonses:xbDFoEDEc0EdT/ClN7vQzwMcvZ5YhTx6Pe7IE9ytTqM=
TXTfacebook-domain-verification=1hsgk1vdsmpc1rn000790euuafh7ej
TXTv=spf1 ip4:204.93.202.186 ip4:128.59.72.0/24 ip4:34.198.225.191 ip4:160.39.80...
SOAext-ns1.columbia.eduhostmaster@columbia.edu serial=7337

edu

DNSSEC🔒 Signed (DS record present)
NSa.edu-servers.net ⭐
NSb.edu-servers.net
NSc.edu-servers.net
NSd.edu-servers.net
NSe.edu-servers.net
NSf.edu-servers.net
NSg.edu-servers.net
NSh.edu-servers.net
NSi.edu-servers.net
NSj.edu-servers.net
NSk.edu-servers.net
NSl.edu-servers.net
NSm.edu-servers.net
SOAa.edu-servers.netnstld@verisign-grs.com serial=1772435516
rank #530504 globally
rank #3143 in the tld
WOT: SAFE (73/100)

Subdomains

apply.tc.edu
www.tc.edu

Same first word

tc.uy
tc.nu
tc.js.cn
tc.te.ua
tc.media
tc.gc.ca
tc.co.th
tc.ht
tc.se
tc.cx
tc.tn
tc.co
tc.nz
tc.ws
tc.by
tc.si
tc.com.tr
tc.im
tc.management
tc.co.za
tc.co.nz
tc.pl
tc.dk
tc.com.ru
tc.de
tc.kg
tc.com.pl
tc.no
tc.com.ua
tc.lt
tc.ee
tc.st
tc.in.th
tc.ink
tc.church
tc.net.pl
tc.com.tw
tc.kz
tc.sg
tc.lviv.ua
tc.lv
tc.org.tw
tc.hatenablog.com
tc.df.gov.br
tc.am
tc.vc
tc.id.au
tc.edu
tc.ru
tc.is
tc.vg
tc.edu.tw
tc.net.br
tc.com.sa
tc.su
tc.my
tc.gob.pe
tc.br
tc.com.na
tc.nl
tc
tc.org
tc.co.kr
tc.cc
tc.to
tc.au
tc.tc
tc.com.cn
tc.tv
tc.cz
tc.services
tc.hu
tc.solutions
tc.web.tr
tc.com
tc.ph
tc.gob.do
tc.be
tc.com.sg
tc.ae
tc.com.mx
tc.ro
tc.ca
tc.mk
tc.net
tc.al
tc.k12.ar.us
tc.uz
tc.com.br
tc.cn

Similar names

ct.org.tw
ct.gold
ct.ac.th
ct.tel
ct.to
ct.lv
ct.ca
ct.id.au
ct.uk
ct.gov.hk
ct.gs
ct.sakura.ne.jp
ct.spb.ru
ct.be
ct.com.mt
ct.company
ct.gr
ct.care
ct.org
ct.com.ua
ct.gop
ct.fit
ct.digital
ct.com
ct.ee
ct.zone
ct.ua
ct.net.au
ct.com.au
ct.ws
ct.ro
ct.com.kz
ct.se
ct.ventures
ct.cx
ct.org.au
ct.com.ar
ct.media
ct.is
ct.st
ct.com.pl
ct.guide
ct.no
ct.gov
ct.kg
ct.academy
ct.gl
ct.ms
ct.net
ct.uy
ct.by
ct.sg
ct.dk

DNS History

14 records (9 active, 5 former)

20162017201820192020202120222023202420252026NSauth1.dns.cogentco.comauth2.dns.cogentco.comext-ns1.columbia.eduauth4.dns.cogentco.comauth5.dns.cogentco.comdns2.itd.umich.edusns-pb.isc.orgMXalt1.aspmx.l.google.comalt2.aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comaspmx.l.google.comA34.196.195.67160.39.80.164
●NSauth1.dns.cogentco.com2021-03-01 → 2026-03-15 · 3 obs
○ 2019-09-26 17:02:24
● 2021-03-01 07:23:48
● 2026-03-15 06:12:20
●NSauth2.dns.cogentco.com2021-03-01 → 2026-03-15 · 3 obs
○ 2019-09-26 17:02:24
● 2021-03-01 07:23:48
● 2026-03-15 06:12:20
○NSauth4.dns.cogentco.com2021-03-01 → 2021-05-22 · 5 obs
○ 2019-09-26 17:02:24
● 2021-03-01 07:23:48
● 2021-05-22 23:37:06
○ 2026-02-16 14:24:00
○ 2026-03-15 06:12:20
○NSauth5.dns.cogentco.com2021-03-01 → 2021-05-22 · 5 obs
○ 2019-09-26 17:02:24
● 2021-03-01 07:23:48
● 2021-05-22 23:37:06
○ 2026-02-16 14:24:00
○ 2026-03-15 06:12:20
○NSdns2.itd.umich.edu2015-08-25 → 2021-05-22 · 4 obs
● 2015-08-25 19:36:58
● 2021-05-22 23:37:06
○ 2026-02-16 14:24:00
○ 2026-03-15 06:12:20
●NSext-ns1.columbia.edu2015-08-25 → 2026-03-15 · 2 obs
● 2015-08-25 19:36:58
● 2026-03-15 06:12:20
○NSsns-pb.isc.org2015-08-25 → 2019-09-26 · 4 obs
● 2015-08-25 19:36:58
● 2019-09-26 17:02:24
○ 2021-03-01 07:23:48
○ 2026-03-15 06:12:20
●MXalt1.aspmx.l.google.com2015-08-25 → 2026-03-15 · 2 obs
● 2015-08-25 19:36:58
● 2026-03-15 06:12:20
●MXalt2.aspmx.l.google.com2015-08-25 → 2026-03-15 · 2 obs
● 2015-08-25 19:36:58
● 2026-03-15 06:12:20
●MXalt3.aspmx.l.google.com2015-08-25 → 2026-03-15 · 2 obs
● 2015-08-25 19:36:58
● 2026-03-15 06:12:20
●MXalt4.aspmx.l.google.com2015-08-25 → 2026-03-15 · 2 obs
● 2015-08-25 19:36:58
● 2026-03-15 06:12:20
●MXaspmx.l.google.com2015-08-25 → 2026-03-15 · 2 obs
● 2015-08-25 19:36:58
● 2026-03-15 06:12:20
○A160.39.80.1642015-08-25 → 2017-01-20 · 4 obs
● 2015-08-25 19:36:58
● 2017-01-20 13:27:20
○ 2017-05-23 00:20:00
○ 2026-03-15 06:12:20
●A34.196.195.672017-05-23 → 2026-03-15 · 3 obs
○ 2017-01-20 13:27:20
● 2017-05-23 00:20:00
● 2026-03-15 06:12:20

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
eduf.edu-servers.net, c.edu-servers.net, i.edu-servers.net, b.edu-servers.net...-
tc.eduauth1.dns.cogentco.com, auth2.dns.cogentco.com, ext-ns1.columbia.edu1 record

✅ Authoritative Response

Server: 128.59.1.1

NS records: auth1.dns.cogentco.com, auth2.dns.cogentco.com, ext-ns1.columbia.edu

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for tc.edu (unsigned zone)

⏱️ Timing

Total: 239ms | Queries: -

📄 Records

TypeCountSample Data
A134.196.195.67
NS3ext-ns1.columbia.edu, auth2.dns.cogentco.com...
MX5alt2.aspmx.l.google.com (pri: 50), alt4.aspmx.l.google.com (pri: 100)...
TXT4amazonses:xbDFoEDEc0EdT/ClN7vQzwMcvZ5YhT, v=spf1 ip4:204.93.202.186 ip4:128.59.72....
SOA1ext-ns1.columbia.edu hostmaster.columbia

📌 Glue Records Collected

Total: 1

Out-of-bailiwick: 1 (ext-ns1.columbia.edu)

Analysis

Hierarchy

tc.edu is a parent of apply.tc.edu and www.tc.edu.

IP Addresses

tc.edu resolves to one IP number: 34.196.195.67.

Other host names, for instance tc.columbia.edu, postsecondaryresearch.org, ec2-34-196-195-67.compute-1.amazonaws.com, teacherscollege.edu and www.tc.edu share IP numbers with tc.edu.

Name Servers

tc.edu is delegated to three name servers: ext-ns1.columbia.edu, auth1.dns.cogentco.com and auth2.dns.cogentco.com.

tc.edu at least partially shares name servers with other domains, including 174.137.204.in-addr.arpa, 134.140.38.in-addr.arpa, 122.216.38.in-addr.arpa, pdx02.atlas.cogentco.com and 207.134.195.in-addr.arpa.

These name servers are commonly used with ext-ns2.columbia.edu, lavinia.cis.cuny.edu, acme.ucc.cuny.edu, ns10.customer.level3.net, ns15.customer.level3.net, ns1.nyp.org, ns2.nyp.org, harlem.cis.cuny.edu, hudson.cis.cuny.edu and apollo.cs.columbia.edu.

Three IP numbers:

ext-ns1.columbia.edu resolves to 2001:18d8::35, 2001:18d8:1::1:1 and 128.59.1.1.

Two IP numbers:

auth1.dns.cogentco.com resolves to 2001:550:1:a::d and 66.28.0.14.

auth2.dns.cogentco.com resolves to 2001:550:1:b::d and 66.28.0.30.

Mail Servers

tc.edu is handled by five mail servers: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

tc.edu shares at least some mail servers with other domains, for example hiddenvalues.com, ns500699.ns500734.ns500693.ns500734.ns500699.ns500734.ns500699.ns500734.ns500699.ns500699.ns500693.ns500683.ns500632.ns500588.ns500588.ns500588.dtrkdll.com, ns500759.ns500758.ns500758.ns500698.ns500698.ns500698.ns500698.ns500736.ns500698.ns500698.ns500708.ns500698.ns500698.ns500619.ns500652.ns500576.trackreceptor.com, ns500671.ns500731.ns500742.ns500731.ns500742.ns500742.ns500704.ns500671.ns500688.ns500678.ns500678.ns500671.lustychickser.com and ns500758.ns500698.ns500758.ns500735.ns500735.ns500736.ns500736.ns500736.ns500698.ns500708.ns500698.ns500652.ns500576.trackreceptor.com.

these mail servers are often used with aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com and aspmx5.googlemail.com.

Host names with two IP numbers:

aspmx.l.google.com points to: 2607:f8b0:4004:c19::1b and 172.253.62.27.

alt1.aspmx.l.google.com points to: 2607:f8b0:4003:c30::1b and 74.125.27.26.

alt2.aspmx.l.google.com points to: 2607:f8b0:4001:c70::1a and 192.178.209.26.

alt3.aspmx.l.google.com points to: 2607:f8b0:4024:c0d::1b and 192.178.152.26.

alt4.aspmx.l.google.com points to: 2607:f8b0:4023:403::1a and 142.250.96.27.