opencourseonline.com - robtex.com

opencourseonline.com

DNSSEC⚠️ Not signed
A45.42.92.203🇺🇸 HENGTONG-145.42.80.0/20 HengTong IDC LLC
A104.143.141.74🇺🇸 Colocrossing-AS104.143.141.0/24
NSa8.share-dns.com ⭐ ⚠️ Not in parent delegation
A172.64.53.25🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSa.share-dns.com ⚠️ Not in zone NS records
A172.64.53.25🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSb.share-dns.net ⚠️ Not in zone NS records
A172.64.52.239🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSb8.share-dns.net ⚠️ Not in parent delegation
A172.64.52.239🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
SOAa.share-dns.commaster@share-dns.com serial=1764853127

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=1774442122
WOT: UNKNOWN (92/100)

Subdomains

www.opencourseonline.com

Same first word

opencourseonline.com

DNS History

19 records (6 active, 13 former)

20162017201820192020202120222023202420252026NSa.share-dns.coma8.share-dns.comb.share-dns.netb8.share-dns.netns1.commonmx.comns100.rookdns.comns2.commonmx.comns99.rookdns.comsk.s5.bns1.ns149.searchreinvented.comsk.s5.bns2.ns149.searchreinvented.comMXmail.b-io.comail.mxproc.comA104.143.141.7445.42.92.203141.8.224.239141.8.225.163208.91.196.4346.166.182.63PTRsk.s5.bns1.ns149.searchreinvented.com
●NSa.share-dns.com2026-03-01 → 2026-03-25 · 3 obs
○ 2017-08-23 16:40:20
● 2026-03-01 08:13:20
● 2026-03-25 12:55:06
●NSa8.share-dns.com2026-03-01 → 2026-03-25 · 3 obs
○ 2017-08-23 16:40:20
● 2026-03-01 08:13:20
● 2026-03-25 12:55:06
●NSb.share-dns.net2026-03-01 → 2026-03-25 · 3 obs
○ 2017-08-23 16:40:20
● 2026-03-01 08:13:20
● 2026-03-25 12:55:06
●NSb8.share-dns.net2026-03-01 → 2026-03-25 · 3 obs
○ 2017-08-23 16:40:20
● 2026-03-01 08:13:20
● 2026-03-25 12:55:06
○NSns1.commonmx.com2016-04-03 → 2016-04-03 · 4 obs
○ 2016-01-01 01:32:02
● 2016-04-03 13:44:32
○ 2016-12-02 12:31:24
○ 2026-03-25 12:55:06
○NSns100.rookdns.com2015-05-13 → 2015-10-11 · 4 obs
● 2015-05-13 05:42:02
● 2015-10-11 09:30:58
○ 2016-01-01 01:32:02
○ 2026-03-25 12:55:06
○NSns2.commonmx.com2016-04-03 → 2016-04-03 · 4 obs
○ 2016-01-01 01:32:02
● 2016-04-03 13:44:32
○ 2016-12-02 12:31:24
○ 2026-03-25 12:55:06
○NSns99.rookdns.com2015-05-13 → 2015-10-11 · 4 obs
● 2015-05-13 05:42:02
● 2015-10-11 09:30:58
○ 2016-01-01 01:32:02
○ 2026-03-25 12:55:06
○NSsk.s5.bns1.ns149.searchreinvented.com2016-01-01 → 2017-08-23 · 7 obs
○ 2015-10-11 09:30:58
● 2016-01-01 01:32:02
○ 2016-04-03 13:44:32
● 2016-12-02 12:31:24
● 2017-08-23 16:40:20
○ 2026-03-01 08:13:20
○ 2026-03-25 12:55:06
○NSsk.s5.bns2.ns149.searchreinvented.com2016-01-01 → 2017-08-23 · 7 obs
○ 2015-10-11 09:30:58
● 2016-01-01 01:32:02
○ 2016-04-03 13:44:32
● 2016-12-02 12:31:24
● 2017-08-23 16:40:20
○ 2026-03-01 08:13:20
○ 2026-03-25 12:55:06
○MXmail.b-io.co2016-01-01 → 2017-08-23 · 7 obs
○ 2015-10-11 09:30:58
● 2016-01-01 01:32:02
○ 2016-04-03 13:44:32
● 2016-12-02 12:31:24
● 2017-08-23 16:40:20
○ 2026-03-01 08:13:20
○ 2026-03-25 12:55:06
○MXmail.mxproc.com2015-05-13 → 2015-10-11 · 4 obs
● 2015-05-13 05:42:02
● 2015-10-11 09:30:58
○ 2016-01-01 01:32:02
○ 2026-03-25 12:55:06
●A104.143.141.742026-03-01 → 2026-03-25 · 3 obs
○ 2017-08-23 16:40:20
● 2026-03-01 08:13:20
● 2026-03-25 12:55:06
○A141.8.224.2392015-05-13 → 2015-10-11 · 4 obs
● 2015-05-13 05:42:02
● 2015-10-11 09:30:58
○ 2016-01-01 01:32:02
○ 2026-03-25 12:55:06
○A141.8.225.1632016-01-01 → 2016-12-02 · 6 obs
○ 2015-10-11 09:30:58
● 2016-01-01 01:32:02
○ 2016-04-03 13:44:32
● 2016-12-02 12:31:24
○ 2017-08-23 16:40:20
○ 2026-03-25 12:55:06
○A208.91.196.432017-08-23 → 2017-08-23 · 4 obs
○ 2016-12-02 12:31:24
● 2017-08-23 16:40:20
○ 2026-03-01 08:13:20
○ 2026-03-25 12:55:06
●A45.42.92.2032026-03-01 → 2026-03-25 · 3 obs
○ 2017-08-23 16:40:20
● 2026-03-01 08:13:20
● 2026-03-25 12:55:06
○A46.166.182.632016-04-03 → 2016-04-03 · 4 obs
○ 2016-01-01 01:32:02
● 2016-04-03 13:44:32
○ 2016-12-02 12:31:24
○ 2026-03-25 12:55:06
○PTRsk.s5.bns1.ns149.searchreinvented.com2016-12-02 → 2017-08-23 · 4 obs
● 2016-12-02 12:31:24
● 2017-08-23 16:40:20
○ 2026-03-01 08:13:20
○ 2026-03-25 12:55:06

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comc.gtld-servers.net, d.gtld-servers.net, m.gtld-servers.net, j.gtld-servers.net...-
opencourseonline.comb8.share-dns.net, a8.share-dns.com1 record

✅ Authoritative Response

Server:172.64.52.239

NS records: b8.share-dns.net, a8.share-dns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opencourseonline.com (unsigned zone)

⏱️ Timing

Total: 221ms | Queries: -

📄 Records

TypeCountSample Data
A2104.143.141.74, 45.42.92.203
NS2a.share-dns.com, b.share-dns.net
SOA1a.share-dns.com master.share-dns.com

📌 Glue Records Collected

Total: 1

Out-of-bailiwick: 1 (a8.share-dns.com)

Analysis

Hierarchy

The parent of www.opencourseonline.com is opencourseonline.com.

IP Addresses

Two IP numbers are pointed to by opencourseonline.com: 45.42.92.203 and 104.143.141.74.

other host names include allinclusivedata.com, www.opencourseonline.com, decorativeconcreteking.com, mx.tlatest.com and tlatest.com; they share IP numbers with opencourseonline.com.

Name Servers

opencourseonline.com delegates to four name servers: a8.share-dns.com, a.share-dns.com, b8.share-dns.net and b.share-dns.net.

opencourseonline.com at least partially shares name servers with other domains, for instance edu-shufe.com, sxkjcx.com, xinchichina.com, buddymerrillmusic.com and dgdaoluhulanchangjia.com.

these name servers are commonly used with a11.share-dns.com, b11.share-dns.net, a2.share-dns.com, b2.share-dns.net, a1.share-dns.com, b1.share-dns.net, a5.share-dns.com, b5.share-dns.net, a3.share-dns.com and b3.share-dns.net.

Hostnames with one IP:

a8.share-dns.com resolves to 172.64.53.25.

a.share-dns.com resolves to 172.64.53.25.

b8.share-dns.net resolves to 172.64.52.239.

b.share-dns.net resolves to 172.64.52.239.

Hostnames resolving to 172.64.53.25: a8.share-dns.com and a.share-dns.com.

Hostnames resolving to 172.64.52.239: b8.share-dns.net and b.share-dns.net.