private boolean isClientIpAddressRejected(final String clientIp) {
        val rejectIpAddresses = adaptiveAuthenticationProperties.getPolicy().getRejectIpAddresses();
        return StringUtils.isNotBlank(rejectIpAddresses)
            && Pattern.compile(rejectIpAddresses).matcher(clientIp).find();
    }
This is {@link BaseIPAddressIntelligenceService}.

@author Misagh Moayyed
@since 6.0.0
core/cas-server-core-authentication-api/src/main/java/org/apereo/cas/authentication/adaptive/intel/BaseIPAddressIntelligenceService.java