`opticalbook.com`

DNSSEC	⚠️ Not signed
A	216.239.32.21^{🇺🇸 Google216.239.32.0/24}
		PTR	`any-in-2015.1e100.net`
A	216.239.34.21^{🇺🇸 Google216.239.34.0/24}
A	216.239.36.21^{🇺🇸 Google216.239.36.0/24}
A	216.239.38.21^{🇺🇸 Google216.239.38.0/24}
NS	`dns1.registrar-servers.com` ⭐
		A	2610:a1:1024::200^{🇺🇸 MAINT-ID-120082610:a1:1024::/48 Neustar}
			PTR	`dns1.namecheaphosting.com`
			PTR	`dns1.registrar-servers.com`
		A	156.154.132.200^{🇺🇸 MAINT-ID-12008156.154.132.0/24 Neustar}
			PTR	`dns1.namecheaphosting.com`
			PTR	`dns1.registrar-servers.com`
NS	`dns2.registrar-servers.com`
		A	2610:a1:1025::200^{🇺🇸 MAINT-ID-120082610:a1:1025::/48 Neustar}
			PTR	`dns2.namecheaphosting.com`
			PTR	`dns2.registrar-servers.com`
		A	156.154.133.200^{🇺🇸 MAINT-ID-12008156.154.133.0/24 Neustar}
			PTR	`dns2.namecheaphosting.com`
			PTR	`dns2.registrar-servers.com`
MX	`eforward1.registrar-servers.com` ⭐
		A	162.255.118.51^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward1.registrar-servers.com`
			PTR	`eforward3.registrar-servers.com`
MX	`eforward2.registrar-servers.com` ⭐
		A	162.255.118.52^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward2.registrar-servers.com`
MX	`eforward3.registrar-servers.com` ⭐
		A	162.255.118.51^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward1.registrar-servers.com`
			PTR	`eforward3.registrar-servers.com`
MX	`eforward4.registrar-servers.com`⁽¹⁵⁾
		A	162.255.118.52^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward2.registrar-servers.com`
MX	`eforward5.registrar-servers.com`⁽²⁰⁾
		A	162.255.118.51^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`eforward1.registrar-servers.com`
			PTR	`eforward3.registrar-servers.com`
TXT	`v=spf1 include:spf.efwd.registrar-servers.com ~all`
SOA	`dns1.registrar-servers.com`hostmaster@registrar-servers.com serial=1779013793

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1784723107

Same first word

opticalbook.com

Similar names

capitolbook.com

DNS History

23 records (11 active, 12 former)

●NSdns1.registrar-servers.com2015-06-06 → 2026-07-22 · 5 obs

● 2015-06-06 00:59:32
○ 2015-10-29 11:58:40
○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●NSdns2.registrar-servers.com2015-06-06 → 2026-07-22 · 5 obs

● 2015-06-06 00:59:32
○ 2015-10-29 11:58:40
○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

○NSdns3.registrar-servers.com2015-06-06 → 2015-06-06 · 3 obs

● 2015-06-06 00:59:32
○ 2015-10-29 11:58:40
○ 2026-07-22 12:36:44

○NSdns4.registrar-servers.com2015-06-06 → 2015-06-06 · 3 obs

● 2015-06-06 00:59:32
○ 2015-10-29 11:58:40
○ 2026-07-22 12:36:44

○NSdns5.registrar-servers.com2015-06-06 → 2015-06-06 · 3 obs

● 2015-06-06 00:59:32
○ 2015-10-29 11:58:40
○ 2026-07-22 12:36:44

○NSns1cnb.domain-resolution.net2016-04-17 → 2016-11-01 · 5 obs

○ 2015-10-29 11:58:40
● 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

○NSns2dhj.domain-resolution.net2016-04-17 → 2016-11-01 · 5 obs

○ 2015-10-29 11:58:40
● 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

○NSns3cna.domain-resolution.net2016-04-17 → 2016-11-01 · 5 obs

○ 2015-10-29 11:58:40
● 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

○NSns4lny.domain-resolution.net2016-04-17 → 2016-11-01 · 5 obs

○ 2015-10-29 11:58:40
● 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

●MXeforward1.registrar-servers.com2026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●MXeforward2.registrar-servers.com2026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●MXeforward3.registrar-servers.com2026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●MXeforward4.registrar-servers.com2026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●MXeforward5.registrar-servers.com2026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

○MXmx.zoho.com2016-04-17 → 2016-11-01 · 4 obs

● 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

○MXmx2.zoho.com2016-04-17 → 2016-11-01 · 4 obs

● 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

○A198.50.144.1002015-06-06 → 2015-06-06 · 3 obs

● 2015-06-06 00:59:32
○ 2015-10-29 11:58:40
○ 2026-07-22 12:36:44

○A204.12.208.742016-04-17 → 2016-04-17 · 4 obs

○ 2015-10-29 11:58:40
● 2016-04-17 23:42:50
○ 2016-11-01 01:41:52
○ 2026-07-22 12:36:44

●A216.239.32.212026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●A216.239.34.212026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●A216.239.36.212026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

●A216.239.38.212026-05-24 → 2026-07-22 · 3 obs

○ 2019-03-14 12:17:08
● 2026-05-24 04:52:22
● 2026-07-22 12:36:44

○A47.88.4.512016-11-01 → 2016-11-01 · 4 obs

○ 2016-04-17 23:42:50
● 2016-11-01 01:41:52
○ 2019-03-14 12:17:08
○ 2026-07-22 12:36:44

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	b.gtld-servers.net, a.gtld-servers.net, g.gtld-servers.net, l.gtld-servers.net...	-
opticalbook.com	dns1.registrar-servers.com, dns2.registrar-servers.com	4 records

✅ Authoritative Response

Server:156.154.133.200

NS records: dns1.registrar-servers.com, dns2.registrar-servers.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opticalbook.com (unsigned zone)

⏱️ Timing

Total: 1971ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`216.239.34.21, 216.239.36.21...`
NS	2	`dns1.registrar-servers.com, dns2.registrar-servers.com`
MX	5	`eforward1.registrar-servers.com (pri: 10, eforward2.registrar-servers.com (pri: 10...`
TXT	1	`v=spf1 include:spf.efwd.registrar-server`
SOA	1	`dns1.registrar-servers.com hostmaster.re`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (dns1.registrar-servers.com, dns1.registrar-servers.com, dns2.registrar-servers.com...)

Analysis

IP Addresses

opticalbook.com has four IP addresses: 216.239.32.21, 216.239.34.21, 216.239.36.21 and 216.239.38.21.

Two other host names, along with hostmaster.kieling.org, collector.vr.fi and firstabm.com, also share IP numbers with opticalbook.com.

Name Servers

opticalbook.com is served by two delegated name servers, dns1.registrar-servers.com and dns2.registrar-servers.com.

opticalbook.com shares its NS records with other domains, for example rv64.com, pasije.pro, freshlypickedbyme.com and two others.

opticalbook.com shares at least some of its name servers with other domains, including triathlonready.com, dhlacpa.net, monero.email and two others.

These name servers are frequently paired with the name servers dns3.registrar-servers.com, dns4.registrar-servers.com and dns5.registrar-servers.com.

Each of the two host names carries two IP addresses: dns1.registrar-servers.com points to 156.154.132.200 and 2610:a1:1024::200, and dns2.registrar-servers.com points to 156.154.133.200 and 2610:a1:1025::200.

Mail Servers

Mail for opticalbook.com is handled by five mail servers, namely eforward1.registrar-servers.com, eforward2.registrar-servers.com, eforward3.registrar-servers.com and two others.

There is at least a partial MX overlap between opticalbook.com and other domains, including pronosur.org, web2-group.com, shawnshellenbarger.com and two others.

eforward4.registrar-servers.com, eforward5.registrar-servers.com, eforward6.registrar-servers.com and eforward7.registrar-servers.com are mail servers that frequently appear together with these mail servers.

Host names that point to one IP address:

eforward1.registrar-servers.com points to the IP address 162.255.118.51.

eforward2.registrar-servers.com points to the IP address 162.255.118.52.

eforward3.registrar-servers.com points to the IP address 162.255.118.51.

eforward4.registrar-servers.com points to the IP address 162.255.118.52.

eforward5.registrar-servers.com points to the IP address 162.255.118.51.

Each of eforward1.registrar-servers.com, eforward3.registrar-servers.com and eforward5.registrar-servers.com resolves to 162.255.118.51.

These two host names — eforward2.registrar-servers.com and eforward4.registrar-servers.com — each point to 162.255.118.52 IP addresses.