Summary
- Hostname
- —
- ASN
- —
- Organization
- United States Postal Service
- Network
- USPS1
- Range
- 56.72.0.0 - 56.72.255.255
- /24 block
- 56.72.0.0/24
- Country
- US
- Blacklists
- 0 of 14
- Abuse contact
- [email protected]
Presence of 56.72.0.166 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 56.72.0.166
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
NetRange: 56.72.0.0 - 56.72.255.255
CIDR: 56.72.0.0/16
NetName: USPS1
NetHandle: NET-56-72-0-0-1
Parent: NET56 (NET-56-0-0-0-0)
NetType: Direct Allocation
OriginAS:
Organization: United States Postal Service (USPS-3-Z)
RegDate: 1992-11-02
Updated: 2024-12-26
Ref: https://rdap.arin.net/registry/ip/56.72.0.0
OrgName: United States Postal Service
OrgId: USPS-3-Z
Address: 4200 Wake Forest Road
City: Raleigh
StateProv: NC
PostalCode: 27668-9007
Country: US
RegDate: 2021-07-27
Updated: 2024-12-26
Ref: https://rdap.arin.net/registry/entity/USPS-3-Z
OrgTechHandle: YOKLA1-ARIN
OrgTechName: Yoklavich, John
OrgTechPhone: +1-919-501-9334
OrgTechEmail: [email protected]
OrgTechRef: https://rdap.arin.net/registry/entity/YOKLA1-ARIN
OrgTechHandle: ZU38-ARIN
OrgTechName: Domain Admin
OrgTechPhone: +1-800-877-7435
OrgTechEmail: [email protected]
OrgTechRef: https://rdap.arin.net/registry/entity/ZU38-ARIN
OrgTechHandle: KONTO18-ARIN
OrgTechName: Kontos, Emmanuel
OrgTechPhone: +1-919-649-7461
OrgTechEmail: [email protected]
OrgTechRef: https://rdap.arin.net/registry/entity/KONTO18-ARIN
OrgAbuseHandle: ZU38-ARIN
OrgAbuseName: Domain Admin
OrgAbusePhone: +1-800-877-7435
OrgAbuseEmail: [email protected]
OrgAbuseRef: https://rdap.arin.net/registry/entity/ZU38-ARIN
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
Related domain names
Domains mentioned in the reverse DNS and the WHOIS of 56.72.0.166.
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 56.72.0.166: 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