opensyllabus.org - dns.ninja

`opensyllabus.org`

DNSSEC	⚠️ Not signed
A	2606:4700:20::681a:28b^{🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:20::681a:38b^{🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:20::ac43:4725^{🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.26.2.139^{Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.26.3.139^{Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.71.37^{🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`aida.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a3a^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`aida.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c03a^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`aida.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:203a^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`aida.ns.cloudflare.com`
		A	108.162.192.58^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`aida.ns.cloudflare.com`
		A	172.64.32.58^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`aida.ns.cloudflare.com`
		A	173.245.58.58^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`aida.ns.cloudflare.com`
NS	`jonah.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bba^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jonah.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1ba^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`jonah.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21ba^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`jonah.ns.cloudflare.com`
		A	108.162.193.186^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jonah.ns.cloudflare.com`
		A	172.64.33.186^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jonah.ns.cloudflare.com`
		A	173.245.59.186^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jonah.ns.cloudflare.com`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c21::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`pe-in-f26.1e100.net`
		A	142.250.31.27^{🇺🇸 Google142.250.31.0/24}
			PTR	`bj-in-f27.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c0f::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.27^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f27.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
MX	`alt3.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:4009:c0f::1a^{🇬🇧 Google2a00:1450:4009::/48}
			PTR	`yulhrs-in-f26.1e100.net`
		A	192.178.223.26^{🇺🇸 Google192.178.223.0/24}
			PTR	`yulhrs-in-f26.1e100.net`
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:400c:c23::1b^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`yubrupd-in-f27.1e100.net`
		A	172.253.157.27^{🇺🇸 Google172.253.0.0/16}
			PTR	`yubrupd-in-f27.1e100.net`
MX	`ukprhjae4wq2gboo7xhai4zbhzxlt3np2mgt3a6ckfq3wvwgortq.mx-verification.google.com`⁽¹⁵⁾
TXT	`MS=ms34179367`
TXT	`google-site-verification=OvuL8IAd9nxb1gbzLg02AvrGzTJRSEobFc3OwQELoqQ`
TXT	`mt-23088137`
HTTPS	HTTP/2 ✓ hints match
		IPv4 hints	104.26.2.139, 104.26.3.139, 172.67.71.37
		IPv6 hints	2606:4700:20::681a:28b, 2606:4700:20::681a:38b, 2606:4700:20::ac43:4725
SOA	`aida.ns.cloudflare.com`dns@cloudflare.com serial=2406646936

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1782749332

rank #279516 globally
rank #21074 in the tld

Subdomains

explorer-api.opensyllabus.org

api.opensyllabus.org

Same first word

opensyllabus.org

DNS History

22 records (14 active, 8 former)

●NSaida.ns.cloudflare.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●NSjonah.ns.cloudflare.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●MXalt1.aspmx.l.google.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●MXalt2.aspmx.l.google.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●MXalt3.aspmx.l.google.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●MXalt4.aspmx.l.google.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●MXaspmx.l.google.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

●MXukprhjae4wq2gboo7xhai4zbhzxlt3np2mgt3a6ckfq3wvwgortq.mx-verification.google.com2026-02-15 → 2026-06-29 · 2 obs

● 2026-02-15 19:49:44
● 2026-06-29 16:34:16

○A104.21.69.52026-02-15 → 2026-05-11 · 4 obs

● 2026-02-15 19:49:44
● 2026-05-11 14:50:32
○ 2026-05-20 11:06:06
○ 2026-06-29 16:34:16

●A104.26.2.1392026-05-20 → 2026-06-29 · 3 obs

○ 2026-05-11 14:50:32
● 2026-05-20 11:06:06
● 2026-06-29 16:34:16

●A104.26.3.1392026-05-20 → 2026-06-29 · 3 obs

○ 2026-05-11 14:50:32
● 2026-05-20 11:06:06
● 2026-06-29 16:34:16

○A172.67.202.372026-02-15 → 2026-05-11 · 4 obs

● 2026-02-15 19:49:44
● 2026-05-11 14:50:32
○ 2026-05-20 11:06:06
○ 2026-06-29 16:34:16

●A172.67.71.372026-05-20 → 2026-06-29 · 3 obs

○ 2026-05-11 14:50:32
● 2026-05-20 11:06:06
● 2026-06-29 16:34:16

○A188.114.96.02026-02-15 → 2026-06-29 · 2 obs

○ 2026-02-15 19:49:44
○ 2026-06-29 16:34:16

○A188.114.97.02026-02-15 → 2026-06-29 · 2 obs

○ 2026-02-15 19:49:44
○ 2026-06-29 16:34:16

●A2606:4700:20::681a:28b2026-05-20 → 2026-06-29 · 3 obs

○ 2026-05-11 14:50:32
● 2026-05-20 11:06:06
● 2026-06-29 16:34:16

●A2606:4700:20::681a:38b2026-05-20 → 2026-06-29 · 3 obs

○ 2026-05-11 14:50:32
● 2026-05-20 11:06:06
● 2026-06-29 16:34:16

●A2606:4700:20::ac43:47252026-05-20 → 2026-06-29 · 3 obs

○ 2026-05-11 14:50:32
● 2026-05-20 11:06:06
● 2026-06-29 16:34:16

○A2606:4700:3030::ac43:ca252026-02-15 → 2026-05-11 · 4 obs

● 2026-02-15 19:49:44
● 2026-05-11 14:50:32
○ 2026-05-20 11:06:06
○ 2026-06-29 16:34:16

○A2606:4700:3037::6815:45052026-02-15 → 2026-05-11 · 4 obs

● 2026-02-15 19:49:44
● 2026-05-11 14:50:32
○ 2026-05-20 11:06:06
○ 2026-06-29 16:34:16

○A2a06:98c1:3120::2026-02-15 → 2026-06-29 · 2 obs

○ 2026-02-15 19:49:44
○ 2026-06-29 16:34:16

○A2a06:98c1:3121::2026-02-15 → 2026-06-29 · 2 obs

○ 2026-02-15 19:49:44
○ 2026-06-29 16:34:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	d0.org.afilias-nst.org, b2.org.afilias-nst.org, b0.org.afilias-nst.org	-
opensyllabus.org	aida.ns.cloudflare.com, jonah.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.58

NS records: aida.ns.cloudflare.com, jonah.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opensyllabus.org (unsigned zone)

⏱️ Timing

Total: 575ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`104.26.3.139, 172.67.71.37...`
AAAA	3	`2606:4700:20::681a:28b, 2606:4700:20::681a:38b...`
NS	2	`aida.ns.cloudflare.com, jonah.ns.cloudflare.com`
MX	6	`ASPMX.L.GOOGLE.COM (pri: 1), ALT3.ASPMX.L.GOOGLE.COM (pri: 10)...`
TXT	3	`MS=ms34179367, google-site-verification=OvuL8IAd9nxb1gb...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h2"]`
SOA	1	`aida.ns.cloudflare.com dns.cloudflare.co`

Analysis

Hierarchy

explorer-api.opensyllabus.org and api.opensyllabus.org each fall under opensyllabus.org as their parent domain.

IP Addresses

opensyllabus.org directs to 6 IP numbers: 104.26.2.139, 104.26.3.139, 172.67.71.37 and 3 other.

Two other host names, along with store.vansaircraft.com, hdopti.com and dohabookfair.qa, also share IP numbers with opensyllabus.org.

Name Servers

Two name servers handle the delegation for opensyllabus.org: aida.ns.cloudflare.com and jonah.ns.cloudflare.com.

opensyllabus.org shares its NS records with other domains, for example docbed.com, herby.info, gandprentals.com and two others.

opensyllabus.org shares at least some of its name servers with other domains, including jennifer-chou.com, ylaie.com, diputi.com and two others.

These name servers are frequently paired with the name servers miki.ns.cloudflare.com, graham.ns.cloudflare.com and beau.ns.cloudflare.com.

DNS names with 6 IP addresses:

aida.ns.cloudflare.com resolves to 108.162.192.58, 172.64.32.58 and 173.245.58.58 among others, with 3 other IP addresses in total.

jonah.ns.cloudflare.com resolves to 108.162.193.186, 172.64.33.186 and 173.245.59.186 among others, with 3 other IP addresses in total.

Mail Servers

opensyllabus.org is handled by 6 mail servers: aspmx.l.google.com, ukprhjae4wq2gboo7xhai4zbhzxlt3np2mgt3a6ckfq3wvwgortq.mx-verification.google.com, alt1.aspmx.l.google.com and 3 other.

There is at least a partial MX overlap between opensyllabus.org and other domains, including ns500698.ns500758.ns500698.ns500698.ns500736.ns500736.ns500736.ns500698.ns500698.ns500698.ns500576.ns500686.ns500619.trackreceptor.com, innofthegovernors.com, ns500671.ns500731.ns500754.ns500731.ns500704.ns500671.ns500678.ns500678.ns500678.ns500678.ns500291.ns500131.lustychickser.com and two others.

These mail servers tend to appear in combination with mail servers alt2.aspmx.l.google.com, alt3.aspmx.l.google.com, alt4.aspmx.l.google.com and 4 others.

Host names that have two IP addresses:

aspmx.l.google.com resolves to two addresses: 142.250.31.27 and 2607:f8b0:4004:c21::1a.

alt1.aspmx.l.google.com resolves to two addresses: 108.177.123.27 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com resolves to two addresses: 172.253.116.26 and 2a00:1450:400b:c02::1a.

alt3.aspmx.l.google.com resolves to two addresses: 192.178.223.26 and 2a00:1450:4009:c0f::1a.

alt4.aspmx.l.google.com resolves to two addresses: 172.253.157.27 and 2a00:1450:400c:c23::1b.