Summary
- Hostname
- —
- ASN
- AS9583
- Organization
- Sify Limited
- Network
- SIFYNET-IN
- Range
- 1.6.0.0 - 1.7.255.255
- /24 block
- 1.6.55.0/24
- Country
- IN
- Blacklists
- 0 of 14
- Abuse contact
- [email protected]
Presence of 1.6.55.4 in blacklists
| List | Status |
|---|---|
| zen.spamhaus.org | Not listed |
| bl.spamcop.net | Not listed |
| black.junkemailfilter.com | Not listed |
| multi.surbl.org | Not listed |
| dnsbl.sorbs.net | Not listed |
| b.barracudacentral.org | Not listed |
| dnsbl.tornevall.org | Not listed |
| dnsbl.httpbl.org | Not listed |
| dnsbl-1.uceprotect.net | Not listed |
| dnsbl-2.uceprotect.net | Not listed |
| dnsbl-3.uceprotect.net | Not listed |
| v4.fullbogons.cymru.com | Not listed |
| bl.blocklist.de | Not listed |
| rbl.blockedservers.com | Not listed |
What is a blacklist (RBL)?
An RBL (Real-time Blackhole List), also known as a DNSBL (DNS-based Blackhole List), is a mechanism used to fight spam by blocking e-mails coming from sources known to send spam. RBLs are databases listing the IP addresses deemed responsible for sending unsolicited e-mail. Mail server administrators use these lists to filter incoming e-mails by checking whether the sender's IP address appears in one or more RBLs. If it does, the e-mail may be rejected or subjected to additional checks.
There are different types of RBLs, each with its own criteria for listing IP addresses. Some focus on IP addresses that send spam directly, while others list IP addresses belonging to networks known to host computers infected with malware and used as bots to send spam. RBL operators keep their lists up to date through automatic and manual contributions, and IP address owners can often request removal from a list if they believe the listing is unjustified.
WHOIS data for 1.6.55.4
% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html
% Information related to '1.6.0.0 - 1.7.255.255'
% Abuse contact for '1.6.0.0 - 1.7.255.255' is '[email protected]'
inetnum: 1.6.0.0 - 1.7.255.255
netname: SIFYNET-IN
descr: Sify Limited
country: IN
admin-c: HS51-AP
tech-c: HS51-AP
mnt-by: MAINT-IN-IRINN
mnt-routes: MAINT-IN-SIFY
mnt-routes: MAINT-IN-IRINN
mnt-lower: MAINT-IN-SIFY
mnt-lower: MAINT-IN-IRINN
mnt-irt: IRT-SIFYNET-IN
status: ALLOCATED PORTABLE
last-modified: 2025-08-11T22:47:01Z
source: APNIC
irt: IRT-SIFYNET-IN
address: Sify Limited,
address: 5th, 6th & 7th floor Reliable Plaza,
address: Kalwa industrial Area, Thane Belapur Road,
address: Airoli, Navi Mumbai-400708
e-mail: [email protected]
abuse-mailbox: [email protected]
admin-c: HS51-AP
tech-c: HS51-AP
auth: # Filtered
mnt-by: MAINT-IN-SIFY
mnt-by: MAINT-IN-IRINN
last-modified: 2026-09-26T06:24:42Z
source: APNIC
person: Hostmaster Satyam Infoway
address: Sify Limited,
address: Second Floor, Tidel Park,
address: No.4,Canal Bank Road,
address: Taramani, Chennai - 600113
country: IN
phone: +914422541125
fax-no: +914422540771
e-mail: [email protected]
nic-hdl: HS51-AP
mnt-by: MAINT-IN-IRINN
last-modified: 2026-05-22T07:41:45Z
source: APNIC
% Information related to '1.6.55.0/24AS9583'
route: 1.6.55.0/24
descr: Sify IP address space
origin: AS9583
notify: [email protected]
mnt-by: MAINT-IN-SIFY
mnt-by: MAINT-IN-IRINN
mnt-routes: MAINT-IN-IRINN
mnt-routes: MAINT-IN-SIFY
last-modified: 2025-12-14T22:14:53Z
source: APNIC
% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-UK2)
Related domain names
Domains mentioned in the reverse DNS and the WHOIS of 1.6.55.4.
What is an IP address?
An IP address is a unique identifier on the internet that identifies a server or an internet user. Here the IP address is 1.6.55.4: it may be the unique address used to reach a website, or the unique address of an internet user.
An SMTP server (a server used to send e-mails) must have a reverse DNS record associated with its IP address