Book61.co.jp 六一書房：考古学・歴史分野の専門書店・出版社新刊を中心に非流通資料、古書、中国・韓国輸入書も

考古学・歴史分野の専門書店・出版社。出版社新刊のほか、学会誌・同人誌・調査報告書などの非流通資料、古書、中国・韓国からの輸入書も扱っています。在庫は常時10万点、20万冊以上。出版部では考古学とその関連分野の専門書を多数刊行しています。

Book61.co.jp Overview

Book61.co.jp ranking shows that the page is at position 5,328,904 over the world.

Book61.co.jp hosting company servers are placed in the Japan, but, unfortunately, it’s not possible to identify the countries where the bulk of book61.co.jp users come from and, therefore, we couldn’t define if the distance can influence the webpage load time. See the list of other webpages hosted on AS-CHOOPA - Choopa, LLC, US servers.

In terms of rank-to-traffic ratio, book61.co.jp has 67 unique users per day, viewing 135 pages. The rank based value of book61.co.jp is 0 USD. Every user makes 2.16 pageviews on average.

Book61.co.jp boasts a link base consisting of 279 referring domains and 350 external backlinks, as revealed by the data obtained from web network scanning.

Book61.co.jp top-level domain belongs to .JP domain zone. Check other webpages in .JP zone.

According the last verification test in July 25, 2024, book61.co.jp has an expired SSL certificate issued by GlobalSign nv-sa (expired on February 04, 2025). Click button “Update” SSL Information at the Safety Information section. Check the list of websites using SSL by GlobalSign nv-sa.

Based on data from Google Safe Browsing, Google Safe Search and Symantec book61.co.jp is a fairly safe domain.

According the Mobile-Friendly test by Google book61.co.jp is nice optimized for mobile devices and tablets, however the webpage speed could be improved.

Book61.co.jp Rank Summary

Global Rank

5,328,904

Average Load Time

2.61sec

Links In Count

Website Value

Audience Geography. Where are book61.co.jp visitors located?

Country	Visitors

Country	Pageviews

Country	Rank

Where do visitors go on book61.co.jp?

Subdomain	Pageviews

Subdomain	Pageviews per User

Subdomain	Reach

How popular is book61.co.jp?

Period	Global Rank	Global Rank Delta
past 3 months	5328904	4396356
past month	13474113	10810730

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	5143727	3790388	0	-86.328%	2	90%
30	13660231	11044872	0	-98.99%	1	-58.678%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	5616832	4815831	4	-92.611%
30	13384060	10585126	0	-97.561%

Book61.co.jp Website Safety

Overview

Last Updated: 10/11/2025

Overall result - book61.co.jp is safe.

We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Last Updated: 03/20/2025

book61.co.jp is safe.

Norton ConnectSafe evaluates book61.co.jp for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 06/12/2017

book61.co.jp is safe.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 01/09/2019

book61.co.jp is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.

Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.

Site Advisor

Last Updated: 02/19/2021

book61.co.jp is safe.

McAfee assesses book61.co.jp for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze book61.co.jp for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 10/11/2025

book61.co.jp child safety is unknown.

The WOT calculates reputation of the book61.co.jp. This reputation system receives ratings from users and information from third-party sources, assesses the book61.co.jp for safety features and confirms, whether book61.co.jp is suitable for children.

SSL Information

SSL Checker Tool

Domain	www.book61.co.jp
Issuer Organization	GlobalSign nv-sa
Issuer	GlobalSign GCC R3 DV TLS CA 2020
Algorithm	RSA-SHA256
Valid form	01/04/2024
Expiration	02/04/2025
Signed	Certificate is not self signed
Additional Domains	www.book61.co.jp book61.co.jp

Book61.co.jp Rank History

Alexa Rank shows how popular book61.co.jp is in comparison with other sites. The most popular site has Alexa Rank equals 1. If book61.co.jp has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to book61.co.jp and pageviews on book61.co.jp over the past 3 months.

Book61.co.jp Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 20473

ASN Title: AS-CHOOPA - Choopa, LLC, US

Last Update: 08/26/2025

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 20473
ASName: AS-CHOOPA
ASHandle: AS20473
RegDate: 2001-05-10
Updated: 2012-03-02
Ref: https://rdap.arin.net/registry/autnum/20473

OrgName: Choopa, LLC
OrgId: CHOOP-1
Address: 14 Cliffwood Ave Suite 300
City: Matawan
StateProv: NJ
PostalCode: 07747
Country: US
RegDate: 2006-10-03
Updated: 2016-01-11
Comment: http://www.choopa.net/
Ref: https://rdap.arin.net/registry/entity/CHOOP-1

OrgAbuseHandle: ABUSE1143-ARIN
OrgAbuseName: Abuse Department
OrgAbusePhone: +1-973-849-0500
OrgAbuseEmail: abuse@choopa.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE1143-ARIN

OrgTechHandle: NETWO1159-ARIN
OrgTechName: Network Operations
OrgTechPhone: +1-973-849-0500
OrgTechEmail: network@choopa.com
OrgTechRef: https://rdap.arin.net/registry/entity/NETWO1159-ARIN

OrgNOCHandle: NETWO1159-ARIN
OrgNOCName: Network Operations
OrgNOCPhone: +1-973-849-0500
OrgNOCEmail: network@choopa.com
OrgNOCRef: https://rdap.arin.net/registry/entity/NETWO1159-ARIN

RTechHandle: NETWO1159-ARIN
RTechName: Network Operations
RTechPhone: +1-973-849-0500
RTechEmail: network@choopa.com
RTechRef: https://rdap.arin.net/registry/entity/NETWO1159-ARIN

RNOCHandle: NETWO1159-ARIN
RNOCName: Network Operations
RNOCPhone: +1-973-849-0500
RNOCEmail: network@choopa.com
RNOCRef: https://rdap.arin.net/registry/entity/NETWO1159-ARIN

RAbuseHandle: ABUSE1143-ARIN
RAbuseName: Abuse Department
RAbusePhone: +1-973-849-0500
RAbuseEmail: abuse@choopa.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABUSE1143-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Book61.co.jp Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

[ JPRS database provides information on network administration. Its use is ]
[ restricted to network administration purposes. For further information, ]
[ use 'whois -h whois.jprs.jp help'. To suppress Japanese output, add'/e' ]
[ at the end of command, e.g. 'whois -h whois.jprs.jp xxx/e'. ]
Domain Information: [ドメイン情報]
a. [ドメイン名] BOOK61.CO.JP
e. [そしきめい] ゆうげんがいしゃろくいちしょぼう
f. [組織名] 有限会社六一書房
g. [Organization] Rokuichi Shyobou Co., Ltd
k. [組織種別] 有限会社
l. [Organization Type] Corporation
m. [登録担当者] KI6953JP
n. [技術連絡担当者] YM1856JP
p. [ネームサーバ] 01.dnsv.jp
p. [ネームサーバ] 02.dnsv.jp
p. [ネームサーバ] 03.dnsv.jp
p. [ネームサーバ] 04.dnsv.jp
s. [署名鍵]
[状態] Connected (2025/03/31)
[登録年月日] 2000/03/21
[接続年月日] 2000/03/26
[最終更新] 2024/04/01 01:01:22 (JST)

DNS Records

DNS Lookup Tool

Host	A Record	TTL
book61.co.jp	210.172.210.83	3600

Host	MX Record	Priority	TTL
book61.co.jp	rs2.ay-sys.com	10	3600

Host	NS Record	TTL
book61.co.jp	01.dnsv.jp	86400
book61.co.jp	02.dnsv.jp	86400
book61.co.jp	03.dnsv.jp	86400
book61.co.jp	04.dnsv.jp	86400

Host	TXT Record	TTL
book61.co.jp	google-site-verification=Eee7_ZAsxhZ37pSgrQY2t798-ZDYg6A-U-QkqYrqo84	3600
book61.co.jp	v=spf1 ip4:210.172.210.83 include:amazonses.com ~all	3600

01.dnsv.jp
TTL: 86400
Email address: hostmaster.dnsv.jp
Serial: 1685976193
Refresh: 3600
Retry: 900
Expire: 604800
Minimum: 300

Book61.co.jp HTML Check

HTML Validation Tool

Errors

Legacy encoding “euc-jp” used. Documents must use UTF-8.

Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)

Almost standards mode doctype. Expected “<!DOCTYPE html>”.

Attribute “xmlns:og” not allowed here.

Attribute “xmlns:fb” not allowed here.

Bad value “text/html;charset=euc-jp” for attribute “content” on element “meta”: “charset=” must be followed by “utf-8”.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

The “width” attribute on the “col” element is obsolete. Use CSS instead.

End tag “form” seen, but there were open elements.

Unclosed element “div”.

Cannot recover after last error. Any further errors will be ignored.

Warnings

Attribute with the local name “xmlns:og” is not serializable as XML 1.0.

Attribute with the local name “xmlns:fb” is not serializable as XML 1.0.

The “type” attribute is unnecessary for JavaScript resources.

The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.

Book61.co.jp Desktop Performance

Last tested: 12/10/2019

Desktop Speed

21%

Optimize images

Enable compression

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Minify JavaScript

Reduce server response time

Minify CSS

Minify HTML

Leverage browser caching

Desktop Resource Breakdown

Total Resources	67
Number of Hosts	6
Static Resources	57
JavaScript Resources	19
CSS Resources	2

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Book61.co.jp 六一書房：考古学・歴史分野の専門書店・出版社新刊を中心に非流通資料、古書、中国・韓国輸入書も

Book61.co.jp Overview

Book61.co.jp Rank Summary

Book61.co.jp Website Safety

Book61.co.jp Rank History

Book61.co.jp Hosting Information

Book61.co.jp Domain Registration and Settings

Book61.co.jp HTML Check

Book61.co.jp Desktop Performance

Book61.co.jp Similar Audits

Book61.co.jp Common Typos