---
name: "zblocklist"
section: "1"
platform: "linux"
package: "zmap"
version: "4.4.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/zblocklist"
---

# zblocklist(1)

zmap IP blocklist tool

## NAME

**zblocklist** - zmap IP blocklist tool

## SYNOPSIS

zblocklist \[ -b \<blocklist\> \] \[ -w \<allowlist\> \] \[ OPTIONS... \]

## DESCRIPTION

*ZBlacklist* is a network tool for limiting and deduplicating a list of IP addresses using a blocklist or allowlist.

## OPTIONS

### BASIC OPTIONS

- **-b**, **--blocklist-file=path**

  File of subnets to exclude, in CIDR notation, one-per line. It is recommended you use this to exclude RFC 1918 addresses, multicast, IANA reserved space, and other IANA special-purpose addresses. An example blocklist file **blocklist.conf** for this purpose.

- **-w**, **--allowlist-file=name**

  File of subnets to include, in CIDR notation, one-per line. All other subnets will be excluded.

- **-l**, **--log-file=name**

  File to log to.

- **--disable-syslog**

  Disable logging messages to syslog.

- **-v**, **--verbosity**

  Level of log detail (0-5, default=3)

- **--no-duplicate-checking**

  Don´t deduplicate input addresses. Default is false.

- **--ignore-blocklist-errors**

  Ignore invalid, malformed, or unresolvable entries in the blocklist/allowlist. Default is false.

- **--ignore-input-errors**

  Don´t print invalid entries in the input. Default is false.

### ADDITIONAL OPTIONS

- **-h**, **--help**

  Print help and exit

- **-V**, **--version**

  Print version and exit