133.51.0.0/16

AS37917 · University of Tsukuba

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Summary

Country	Japan
Domain	nic.ad.jp
ASN	AS37917
Registry	APNIC
ID	JPNIC-NET-JP-ERX

WHOIS Details

inetnum:        133.0.0.0 - 133.255.255.255
netname:        JPNIC-NET-JP-ERX
descr:          Japan Network Information Center
country:        JP
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
abuse-c:        AJ382-AP
remarks:        133/8 block is an ERX range which transfered from
remarks:        ARIN to APNIC on 2009-10-30
remarks:        The original allocation date was 1997-03-01
remarks:        Please search  whois.nic.ad.jp for more information
remarks:        about this range
remarks:        % whois -h whois.nic.ad.jp ***.***.***.***/e
status:         ALLOCATED PORTABLE
mnt-by:         APNIC-HM
mnt-lower:      MAINT-JPNIC
mnt-irt:        IRT-JPNIC-JP
last-modified:  2022-11-01T04:33:10Z
source:         APNIC

irt:            IRT-JPNIC-JP
address:        Uchikanda OS Bldg 4F, 2-12-6 Uchi-Kanda
address:        Chiyoda-ku, Tokyo 101-0047, japan
e-mail:         hostmaster@nic.ad.jp
abuse-mailbox:  hostmaster@nic.ad.jp
phone:          +81-3-5297-2311
fax-no:         +81-3-5297-2312
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
auth:           # Filtered
remarks:        hostmaster@nic.ad.jp was validated on 2024-11-27
mnt-by:         MAINT-JPNIC
last-modified:  2025-09-04T01:00:00Z
source:         APNIC

role:           ABUSE JPNICJP
country:        ZZ
address:        Uchikanda OS Bldg 4F, 2-12-6 Uchi-Kanda
address:        Chiyoda-ku, Tokyo 101-0047, japan
phone:          +81-3-5297-2311
fax-no:         +81-3-5297-2312
e-mail:         hostmaster@nic.ad.jp
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
nic-hdl:        AJ382-AP
remarks:        Generated from irt object IRT-JPNIC-JP
remarks:        hostmaster@nic.ad.jp was validated on 2024-11-27
abuse-mailbox:  hostmaster@nic.ad.jp
mnt-by:         APNIC-ABUSE
last-modified:  2025-01-23T00:15:35Z
source:         APNIC

role:           Japan Network Information Center
address:        Uchikanda OS Bldg 4F, 2-12-6 Uchi-Kanda
address:        Chiyoda-ku, Tokyo 101-0047, Japan
country:        JP
phone:          +81-3-5297-2311
fax-no:         +81-3-5297-2312
e-mail:         hostmaster@nic.ad.jp
admin-c:        JI13-AP
tech-c:         JE53-AP
nic-hdl:        JNIC1-AP
mnt-by:         MAINT-JPNIC
last-modified:  2022-01-05T03:04:02Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 133.0.0.0/8

Range	ASN	Company	Num of IPs
133.237.0.0/16	AS23820	Rakuten Group, Inc.	65,536
133.114.0.0/16	AS2527	Sony Network Communications Inc.	65,536
133.123.0.0/16	AS7522	STNet, Incorporated	65,536
133.125.0.0/16	AS7684	SAKURA Internet Inc.	65,536
133.137.0.0/16	AS2497	Internet Initiative Japan Inc.	65,536
133.175.0.0/16	AS2519	ARTERIA Networks Corporation	65,536
133.159.0.0/16	AS2497	Internet Initiative Japan Inc.	65,536
133.112.0.0/16	AS2522	Japan Network Information Center	65,536
133.110.0.0/16	AS2497	Internet Initiative Japan Inc.	65,536
133.218.0.0/16	AS2497	Internet Initiative Japan Inc.	65,536
133.167.0.0/16	AS9371	SAKURA Internet Inc.	65,536
133.142.0.0/16	AS2497	Internet Initiative Japan Inc.	65,536
133.18.0.0/16	AS24282	KAGOYA JAPAN Inc.	65,536
133.163.0.0/16	AS2510	FUJITSU LIMITED	65,536
133.236.0.0/16	AS2497	Internet Initiative Japan Inc.	65,536
133.242.0.0/16	AS7684	SAKURA Internet Inc.	65,536
133.155.0.0/17	AS7524	ITEC Hankyu Hanshin Co.,Ltd.	32,768
133.155.128.0/17	AS7524	ITEC Hankyu Hanshin Co.,Ltd.	32,768
133.186.128.0/17	AS45974	NHN Cloud Japan Corporation	32,768
133.232.128.0/17	AS2514	NTT PC Communications,Inc.	32,768
133.130.128.0/17	AS2514	NTT PC Communications,Inc.	32,768
133.32.0.0/18	AS2519	ARTERIA Networks Corporation	16,384
133.149.192.0/18	AS2519	ARTERIA Networks Corporation	16,384
133.247.0.0/18	AS131918	SHONAN CABLE NETWORK	16,384
133.149.128.0/18	AS4677	Marubeni OKI Network Solutions Inc.	16,384
133.186.64.0/18	AS131915	Hamamatsu Cable Television .Inc	16,384
133.165.192.0/18	AS17534	NSK Co.,Ltd.	16,384
133.238.64.0/18	AS131958	TAMA CABLE NETWORK CO., LTD.	16,384
133.165.128.0/18	AS2527	Sony Network Communications Inc.	16,384
133.226.64.0/19	AS7524	ITEC Hankyu Hanshin Co.,Ltd.	8,192
133.238.32.0/19	AS2497	IIJ Internet	8,192
133.232.64.0/19	AS2514	INTERLINK Co.,LTD	8,192
133.32.224.0/19	AS2519	ARTERIA Networks Corporation	8,192
133.232.0.0/19	AS7682	DMG MORI Digital Co., LTD.	8,192
133.226.96.0/19	AS9997	CTY Co.,Ltd.	8,192
133.226.144.0/20	AS24279	SENDAI CATV CO.,LTD.	4,096
133.186.0.0/20	AS10010	TOKAI Communications Corporation	4,096
133.32.80.0/20	AS131918	SHONAN CABLE NETWORK	4,096
133.247.144.0/20	AS131949	General Incorporated Foundation Aso Telework Center	4,096
133.238.16.0/20	AS2497	IIJ Internet	4,096
133.32.128.0/20	AS2519	ARTERIA Networks Corporation	4,096
133.226.0.0/20	AS131934	ICC Corporation	4,096
133.32.176.0/20	AS2519	ARTERIA Networks Corporation	4,096
133.232.112.0/20	AS2514	INTERLINK Co.,LTD	4,096
133.88.48.0/20	AS23778	IMIZU CABLE NETWORK CO.,LTD.	4,096
133.226.160.0/20	AS17958	Kasaoka Cable Vision LIMITED	4,096
133.88.32.0/20	AS18281	Chitahanto Cable Network Corp.	4,096
133.226.16.0/20	AS23624	Chukai Television Co,.Ltd.	4,096
133.32.208.0/20	AS2519	ARTERIA Networks Corporation	4,096
133.247.240.0/20	AS131923	MCAT Ltd.	4,096

Hosted domains

There are 2 domain names hosted across 2 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
133.51.14.117	icadl2016.org	1
133.51.2.252	crowd4u.net	1

Hosted domains API

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Useful for Cybersecurity

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Pingable IPs

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
101.185.74.160	AS1221 Telstra Limited	`12.71ms` from Adelaide, AU
82.77.211.80	AS8708 DIGI ROMANIA S.A.	`8.33ms` from Bucharest, RO
87.229.103.176	AS60071 RendszerNET Kft.	`0.17ms` from Budapest, HU
175.7.2.16	AS4134 CHINANET-BACKBONE	`2.94ms` from Changsha, CN
129.206.81.64	AS553 BelWue-Koordination	`3.68ms` from Frankfurt am Main, DE
46.105.34.160	AS16276 OVH SAS	`0.05ms` from Gravelines, FR
87.65.251.192	AS5432 Proximus NV	`5.11ms` from Gravelines, FR
139.28.172.16	AS211440 Karolio IT paslaugos, UAB	`0.11ms` from Hong Kong, HK
39.56.119.176	AS17557 Pakistan Telecommunication Company Limited	`2.94ms` from Islamabad, PK
13.37.13.112	AS16509 Amazon.com, Inc.	`0.13ms` from Paris, FR
129.24.149.208	AS3388 University of New Mexico	`14.66ms` from Phoenix, US
177.154.165.64	AS262288 Go In Tecnologia	`7.28ms` from Rio de Janeiro, BR
31.191.121.32	AS1267 WIND TRE S.P.A.	`3.86ms` from Rome, IT
218.12.166.64	AS4837 CHINA UNICOM China169 Backbone	`10.58ms` from Tianjin, CN
122.208.196.64	AS17506 ARTERIA Networks Corporation	`0.99ms` from Tokyo, JP
126.102.227.80	AS17676 SoftBank Corp.	`10.22ms` from Tokyo, JP
115.162.177.96	AS2527 Sony Network Communications Inc.	`17.56ms` from Tokyo, JP
72.39.182.32	AS7992 Cogeco Connexion Inc.	`10.94ms` from Toronto, CA
151.243.106.80	AS6079 RCN	`1.45ms` from Ashburn, US
172.220.168.0	AS20115 Charter Communications LLC	`11.42ms` from Atlanta, US
108.250.34.48	AS7018 AT&T Enterprises, LLC	`12.11ms` from Chicago, US
3.67.115.80	AS16509 Amazon.com, Inc.	`0.19ms` from Frankfurt am Main, DE
93.192.187.208	AS3320 Deutsche Telekom AG	`7.26ms` from Frankfurt am Main, DE
120.232.124.64	AS9808 China Mobile Communications Group Co., Ltd.	`3.15ms` from Guangzhou, CN
52.119.226.208	AS16509 Amazon.com, Inc.	`0.55ms` from Reston, US

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -m5 133.51.50.110

traceroute to 133.51.50.110 (133.51.50.110): 5 hops max, 52 byte packets

1 [AS263812] 38.165.233.1 0.104 ms

2 [AS52468] 181.78.95.209 0.725 ms

3 *

4 *

5 *

Measurement taken from

IPinfo ProbeNet in Asuncion, PY

On November 14th 2025

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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